Best Flat Roof Waterproofing Paint of 2025

Last updated on 24/10/2025
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1
Cromar Grey Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 4 x 5Kg
Cromar Grey Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 4 x 5Kg
Cromapol
Why we love it
  • Instant waterproof protection in one coat.
  • Bridges gaps with added fibres.
  • Usable in both dry, damp conditions.
Main Highlights
  • One Coat Instant Waterproof Protection
  • Added Fibres To Bridge Gaps
  • Used in Dry and Damp Condiitons
  • Coverage 1-2m2 per kg
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9.7
Exceptional
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9.7
Exceptional
Cromapol
Cromar Grey Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 4 x 5Kg
Why we love it
  • Instant waterproof protection in one coat.
  • Bridges gaps with added fibres.
  • Usable in both dry, damp conditions.
Main Highlights
  • One Coat Instant Waterproof Protection
  • Added Fibres To Bridge Gaps
  • Used in Dry and Damp Condiitons
  • Coverage 1-2m2 per kg
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Value for Money
2
Resincoat Liquid Rubber Roof Coating, Waterproof Sealant for Roofing, DIY Friendly Repair, Quick Drying Leak Seal Technology, Long-term Performance, One-Coat Outdoor Roof Paint, Black, 5 Litres
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Resincoat Liquid Rubber Roof Coating, Waterproof Sealant for Roofing, DIY Friendly Repair, Quick Drying Leak Seal Technology, Long-term Performance, One-Coat Outdoor Roof Paint, Black, 5 Litres
Resincoat
Why we love it
  • DIY-friendly with one coat application.
  • UV stable, preventing discolouration.
  • Offers superb, cost-effective coverage.
Main Highlights
  • Easy DIY Friendly Application - No need for multiple coats and priming – Resincoat Liquid Rubber Waterproof Coating requires just one easy application with brush or roller, saving you time and energy while delivering professional-quality results.
  • Advanced Waterproofing Solution - Formulated to last, Resincoat Liquid Rubber is ideal for repairing flat or pitched roofs and other surfaces on substrates such as concrete, brick, asphalt, GRP, metal, felt, OSB and more.
  • Formulated for UK Weather - Manufactured in the UK and designed to withstand prolonged exposure to typical UK weather conditions with UV stability protecting from sunlight and discolouring.
  • Flexible Waterproof Membrane - Superb adhesion and efficient one-coat application create a seamless waterproof membrane with high flexibility and elasticity to last for 10 years or more. Apply and enjoy reliable waterproofing.
  • Reliable, Long-term Performance - Trust in the 10-year life expectancy of our waterproof sealant paint to keep your roof leak-free and corrosion-resistant. From emergency repairs or routine maintenance, Resincoat Liquid Rubber Roof Coating delivers enduring results for both DIY enthusiasts and industrial users.
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9.5
Superb
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9.5
Superb
Resincoat
Resincoat Liquid Rubber Roof Coating, Waterproof Sealant for Roofing, DIY Friendly Repair, Quick Drying Leak Seal Technology, Long-term Performance, One-Coat Outdoor Roof Paint, Black, 5 Litres
Why we love it
  • DIY-friendly with one coat application.
  • UV stable, preventing discolouration.
  • Offers superb, cost-effective coverage.
Main Highlights
  • Easy DIY Friendly Application - No need for multiple coats and priming – Resincoat Liquid Rubber Waterproof Coating requires just one easy application with brush or roller, saving you time and energy while delivering professional-quality results.
  • Advanced Waterproofing Solution - Formulated to last, Resincoat Liquid Rubber is ideal for repairing flat or pitched roofs and other surfaces on substrates such as concrete, brick, asphalt, GRP, metal, felt, OSB and more.
  • Formulated for UK Weather - Manufactured in the UK and designed to withstand prolonged exposure to typical UK weather conditions with UV stability protecting from sunlight and discolouring.
  • Flexible Waterproof Membrane - Superb adhesion and efficient one-coat application create a seamless waterproof membrane with high flexibility and elasticity to last for 10 years or more. Apply and enjoy reliable waterproofing.
  • Reliable, Long-term Performance - Trust in the 10-year life expectancy of our waterproof sealant paint to keep your roof leak-free and corrosion-resistant. From emergency repairs or routine maintenance, Resincoat Liquid Rubber Roof Coating delivers enduring results for both DIY enthusiasts and industrial users.
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3
CROMAR Cromapol Fibre-Free Acrylic Roof Coating – Liquid Acrylic Waterproofing Solution | White Primer – 20 KG
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CROMAR Cromapol Fibre-Free Acrylic Roof Coating – Liquid Acrylic Waterproofing Solution | White Primer – 20 KG
ARA CHOICE
16% Off
Why we love it
  • Instant waterproofing with one coat.
  • Bonds well to surfaces.
  • Cost-effective with excellent coverage.
Main Highlights
  • Instant Waterproofing: One coat application provides immediate protection against water ingress.
  • Excellent Adhesion: Bonds well to various surfaces, including flat and pitched roofs, roof lights, and more.
  • High Solar Reflectivity: White and Grey variants offer excellent solar reflectivity.
  • Fully Flexible and Seamless: Ensures durability and longevity of the waterproofing layer.
  • Economical: Cost-effective waterproofing with excellent coverage rates.
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9.4
Superb
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9.4
Superb
ARA CHOICE
CROMAR Cromapol Fibre-Free Acrylic Roof Coating – Liquid Acrylic Waterproofing Solution | White Primer – 20 KG
16% Off
Why we love it
  • Instant waterproofing with one coat.
  • Bonds well to surfaces.
  • Cost-effective with excellent coverage.
Main Highlights
  • Instant Waterproofing: One coat application provides immediate protection against water ingress.
  • Excellent Adhesion: Bonds well to various surfaces, including flat and pitched roofs, roof lights, and more.
  • High Solar Reflectivity: White and Grey variants offer excellent solar reflectivity.
  • Fully Flexible and Seamless: Ensures durability and longevity of the waterproofing layer.
  • Economical: Cost-effective waterproofing with excellent coverage rates.
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4
Bostik Flexacryl Instant Repair Waterproof Compound for Flat Roofs, Colour: Grey, 5kg
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Bostik Flexacryl Instant Repair Waterproof Compound for Flat Roofs, Colour: Grey, 5kg
Bostik
Why we love it
  • Provides immediate waterproofing.
  • Versatile for wet surfaces.
  • Flexible and long-lasting.
Main Highlights
  • A high performance, instant roof repair compound, ideal for emergency repairs or general waterproofing
  • One coat application providing immediate waterproofing
  • For wet or dry surfaces, Can be applied in damp conditions
  • Flexible and long lasting, Contains fibres to bridge gaps
  • Contents: 1x Bostik Flexacryl Instant Repair for Flat Roofs, Colour: Grey, 5kg
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9.3
Superb
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9.3
Superb
Bostik
Bostik Flexacryl Instant Repair Waterproof Compound for Flat Roofs, Colour: Grey, 5kg
Why we love it
  • Provides immediate waterproofing.
  • Versatile for wet surfaces.
  • Flexible and long-lasting.
Main Highlights
  • A high performance, instant roof repair compound, ideal for emergency repairs or general waterproofing
  • One coat application providing immediate waterproofing
  • For wet or dry surfaces, Can be applied in damp conditions
  • Flexible and long lasting, Contains fibres to bridge gaps
  • Contents: 1x Bostik Flexacryl Instant Repair for Flat Roofs, Colour: Grey, 5kg
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5
Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Black, 5 Liters)
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Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Black, 5 Liters)
SIRAMICO COATINGS
Why we love it
  • Versatile for various surfaces.
  • No primer or second coat.
  • Long-lasting waterproof protection.
Main Highlights
  • ✅Designed for both flat and pitched roofs, this high-performance coating adheres to a wide range of surfaces, including asphalt, brick, concrete, GRP, metal, felt, OSB, and more.
  • ✅No primer needed, no second coat required—just a single, easy application with a brush or roller. Siramico Coatings Liquid Rubber Coating is perfect for hassle-free DIY use, delivering a professional finish with minimal effort.
  • ✅Forming a seamless, elastic membrane, this liquid rubber coating expands and contracts with your surface, providing strong adhesion and waterproofing that lasts up to 10 years.
  • ✅Quick drying and ease to use straight out of the can liquid rubber solution for all your waterproofing requirements.
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9.2
Superb
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9.2
Superb
SIRAMICO COATINGS
Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Black, 5 Liters)
Why we love it
  • Versatile for various surfaces.
  • No primer or second coat.
  • Long-lasting waterproof protection.
Main Highlights
  • ✅Designed for both flat and pitched roofs, this high-performance coating adheres to a wide range of surfaces, including asphalt, brick, concrete, GRP, metal, felt, OSB, and more.
  • ✅No primer needed, no second coat required—just a single, easy application with a brush or roller. Siramico Coatings Liquid Rubber Coating is perfect for hassle-free DIY use, delivering a professional finish with minimal effort.
  • ✅Forming a seamless, elastic membrane, this liquid rubber coating expands and contracts with your surface, providing strong adhesion and waterproofing that lasts up to 10 years.
  • ✅Quick drying and ease to use straight out of the can liquid rubber solution for all your waterproofing requirements.
Show More
6
Cromar Grey Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 2 x 5Kg
Cromar Grey Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 2 x 5Kg
Cromapol
Why we love it
  • Offers instant waterproof protection.
  • Bridges gaps with added fibres.
  • Applicable in various conditions.
Main Highlights
  • One Coat Instant Waterproof Protection
  • Added Fibres To Bridge Gaps
  • Used in Dry and Damp Condiitons
  • Coverage 1-2m2 per kg
Show More
9.2
Superb
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9.2
Superb
Cromapol
Cromar Grey Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 2 x 5Kg
Why we love it
  • Offers instant waterproof protection.
  • Bridges gaps with added fibres.
  • Applicable in various conditions.
Main Highlights
  • One Coat Instant Waterproof Protection
  • Added Fibres To Bridge Gaps
  • Used in Dry and Damp Condiitons
  • Coverage 1-2m2 per kg
Show More
7
Polar Bitumenseal Grey Paint - 5KG - Instant Waterproof Bitumen Roof Sealant - Ideal for Leaks, Cracks & Pitched Roof Repair - Concrete, Brick, Asphalt, Drainpipes & Gutters - Easy to Apply
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Polar Bitumenseal Grey Paint - 5KG - Instant Waterproof Bitumen Roof Sealant - Ideal for Leaks, Cracks & Pitched Roof Repair - Concrete, Brick, Asphalt, Drainpipes & Gutters - Easy to Apply
Polar Specialist Coatings
Free Shipping
Why we love it
  • Instant and durable waterproof seal.
  • Easy, one-coat application process.
  • Long-lasting, protective finish.
Main Highlights
  • Instant Waterproof Seal: The ideal solvent-free solution for immediate and complete sealing of emergency leaks or cracks. Apply directly to the affected area to quickly seal and protect. This bitumen roof sealant forms a robust, waterproof membrane to keep damp and water out, ensuring reliable long-term results
  • One Coat Application: Efficiently seal cracks or leaks with just one coat, saving you time and effort. A 5kg container covers up to 5m², delivering optimal waterproof protection with a single application. This bitumen paint solution is suitable for various uses, ensuring excellent results. Perfect for both residential and commercial applications
  • Multi-Surface Compatibility: Specially formulated with reinforced fibres that interlace to provide reliable protection. The water-resistant solution offers a resilient finish that works on drain pipes, gutters, GRP, flat and pitched roofs, bitumen, metal, fibreglass, and concrete
  • Easy to Apply: No primer is needed before applying Polar Bitumenseal waterproofing paint. Apply immediately and directly for instant protection. Clear the affected area of moss and debris, and remove any surface water, oil, or grease. Use a brush or roller depending on the size of the area. Touch dry within 3 hours. Allow 24 hours to fully dry. Note: Should not be applied in poor drying conditions or when rain is imminent
  • Attractive Finish: Polar Bitumenseal is a water-based solution that provides long-lasting protection. Available in grey, white, and black finishes and is available in a convenient 5kg size to suit any job. Dries to form a durable and water-resistant finish, ensuring a professional and clean appearance every time
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9.0
Superb
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9.0
Superb
Polar Specialist Coatings
Polar Bitumenseal Grey Paint - 5KG - Instant Waterproof Bitumen Roof Sealant - Ideal for Leaks, Cracks & Pitched Roof Repair - Concrete, Brick, Asphalt, Drainpipes & Gutters - Easy to Apply
Free Shipping
Why we love it
  • Instant and durable waterproof seal.
  • Easy, one-coat application process.
  • Long-lasting, protective finish.
Main Highlights
  • Instant Waterproof Seal: The ideal solvent-free solution for immediate and complete sealing of emergency leaks or cracks. Apply directly to the affected area to quickly seal and protect. This bitumen roof sealant forms a robust, waterproof membrane to keep damp and water out, ensuring reliable long-term results
  • One Coat Application: Efficiently seal cracks or leaks with just one coat, saving you time and effort. A 5kg container covers up to 5m², delivering optimal waterproof protection with a single application. This bitumen paint solution is suitable for various uses, ensuring excellent results. Perfect for both residential and commercial applications
  • Multi-Surface Compatibility: Specially formulated with reinforced fibres that interlace to provide reliable protection. The water-resistant solution offers a resilient finish that works on drain pipes, gutters, GRP, flat and pitched roofs, bitumen, metal, fibreglass, and concrete
  • Easy to Apply: No primer is needed before applying Polar Bitumenseal waterproofing paint. Apply immediately and directly for instant protection. Clear the affected area of moss and debris, and remove any surface water, oil, or grease. Use a brush or roller depending on the size of the area. Touch dry within 3 hours. Allow 24 hours to fully dry. Note: Should not be applied in poor drying conditions or when rain is imminent
  • Attractive Finish: Polar Bitumenseal is a water-based solution that provides long-lasting protection. Available in grey, white, and black finishes and is available in a convenient 5kg size to suit any job. Dries to form a durable and water-resistant finish, ensuring a professional and clean appearance every time
Show More
8
Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Clear, 5 Liters)
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Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Clear, 5 Liters)
SIRAMICO COATINGS
Why we love it
  • Versatile for various surfaces.
  • Hassle-free single application.
  • Long-lasting waterproof protection.
Main Highlights
  • ✅Designed for both flat and pitched roofs, this high-performance coating adheres to a wide range of surfaces, including asphalt, brick, concrete, GRP, metal, felt, OSB, and more.
  • ✅No primer needed, no second coat required—just a single, easy application with a brush or roller. Siramico Coatings Liquid Rubber Coating is perfect for hassle-free DIY use, delivering a professional finish with minimal effort.
  • ✅Forming a seamless, elastic membrane, this liquid rubber coating expands and contracts with your surface, providing strong adhesion and waterproofing that lasts up to 10 years.
  • ✅Quick drying and ease to use straight out of the can liquid rubber solution for all your waterproofing requirements.
Show More
8.8
Excellent
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8.8
Excellent
SIRAMICO COATINGS
Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Clear, 5 Liters)
Why we love it
  • Versatile for various surfaces.
  • Hassle-free single application.
  • Long-lasting waterproof protection.
Main Highlights
  • ✅Designed for both flat and pitched roofs, this high-performance coating adheres to a wide range of surfaces, including asphalt, brick, concrete, GRP, metal, felt, OSB, and more.
  • ✅No primer needed, no second coat required—just a single, easy application with a brush or roller. Siramico Coatings Liquid Rubber Coating is perfect for hassle-free DIY use, delivering a professional finish with minimal effort.
  • ✅Forming a seamless, elastic membrane, this liquid rubber coating expands and contracts with your surface, providing strong adhesion and waterproofing that lasts up to 10 years.
  • ✅Quick drying and ease to use straight out of the can liquid rubber solution for all your waterproofing requirements.
Show More
9
Roofix 20/10 Multi-Surface | Roof & Gutter Repair | Instant Waterproofing Solution for Flat Roofs and guttering | Black, Grey or White (Black) | 5 litres
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Roofix 20/10 Multi-Surface | Roof & Gutter Repair | Instant Waterproofing Solution for Flat Roofs and guttering | Black, Grey or White (Black) | 5 litres
Flag Paints
Free Shipping
Why we love it
  • Superb flexibility and longevity.
  • Easily applicable on roofs.
  • Generous coverage ratio.
Main Highlights
  • Easy to apply
  • Excellent flexibility and durability
  • Can be applied to virtually any roofing material (not rubber)
  • Can last in excess of 10 year
  • Coverage is approximately 1 litre per m², nb corrugated & porous surfaces have a lower coverage
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8.7
Excellent
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8.7
Excellent
Flag Paints
Roofix 20/10 Multi-Surface | Roof & Gutter Repair | Instant Waterproofing Solution for Flat Roofs and guttering | Black, Grey or White (Black) | 5 litres
Free Shipping
Why we love it
  • Superb flexibility and longevity.
  • Easily applicable on roofs.
  • Generous coverage ratio.
Main Highlights
  • Easy to apply
  • Excellent flexibility and durability
  • Can be applied to virtually any roofing material (not rubber)
  • Can last in excess of 10 year
  • Coverage is approximately 1 litre per m², nb corrugated & porous surfaces have a lower coverage
Show More
10
Cromar Black Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 2 x 5Kg
Cromar Black Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 2 x 5Kg
Cromapol
Why we love it
  • Instant waterproof protection in one coat.
  • Bridges gaps with added fibers.
  • Useable in dry, damp conditions.
Main Highlights
  • One Coat Instant Waterproof Protection
  • Added Fibres To Bridge Gaps
  • Used in Dry and Damp Condiitons
  • Coverage 1-2m2 per kg
Show More
8.7
Excellent
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8.7
Excellent
Cromapol
Cromar Black Cromapol Acrylic Fibre Reinforced Roof Coat Sealant Paint 2 x 5Kg
Why we love it
  • Instant waterproof protection in one coat.
  • Bridges gaps with added fibers.
  • Useable in dry, damp conditions.
Main Highlights
  • One Coat Instant Waterproof Protection
  • Added Fibres To Bridge Gaps
  • Used in Dry and Damp Condiitons
  • Coverage 1-2m2 per kg
Show More

We scanned 1990 products

We reviewed these offers relevant to the Flat Roof Waterproofing Paint within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Cromapol, Resincoat, ARA CHOICE, Bostik, SIRAMICO COATINGS, Polar Specialist Coatings, Flag Paints, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.
For the best Flat Roof Waterproofing Paint in the market, we considered we took a deep dive into 9951 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that: