10 Best Upvc Window Sealant in The UK

Last updated on 17/07/2025
Advertising disclosure
Best Choice
1
9.8
Exceptional
BONDIFY Waterproof Window Frame Sealant White 500g x 3PCs, 100% SOLVENT-FREE Paintable Silicone Sealant Acrylic, White Mastic for Filling Cracks and Gaps, Bathroom, Kitchen, Door, Upvc use
BONDIFY
BONDIFY Waterproof Window Frame Sealant White 500g x 3PCs, 100% SOLVENT-FREE Paintable Silicone Sealant Acrylic, White Mastic for Filling Cracks and Gaps, Bathroom, Kitchen, Door, Upvc use
Free Shipping
Why We Love It
  • Flexible and paintable finish.
  • Non-toxic and no odor.
  • Ideal for interior use.
Main Highlights
  • BONDIFY SILICONISED SEALANT (WHITE - 3PCs) : BONDIFY paintable sealant is a general purpose, water based sealant for caulking, sealing and decoration uses in waterproofing, gap filling, wood frame joints, doors & windows sash, drywall, plaster, marble, tile & brick works, painters sealant for interior works.
  • KEY FEATURES : Its siliconized structure, makes it possible to handle movement up to 15%. Water based, Mildew resistant, Non-toxic No Odour. Very low VOC content. Over Paintable. Environmental friendly, easily clean up with water.
  • APPLICATION AREAS-1 :Sealing of low movement joints between various construction materials(wood, concrete, brick etc.) It’s ideal for sealing and filling gaps, cracks, and joints around windows, frames, doors, baseboards, drywall, plaster, woodwork, moldings, and trim.
  • APPLICATION AREAS-2 : Used in areas that are not in direct contact with water, like along the edges of countertop, backsplash, toilet seat, bathroom floor wall joint.
  • STANDS OUT : BONDIFY Siliconized Sealant provides a flexible, paintable finish and is often applied to areas that require a durable, weather-resistant, and moisture-resistant seal.
9.8
Exceptional
Amazon Logo
Best Value
2
9.7
Exceptional
Hemway - Construction All-In-One Hybrid Polymer Sealant & Adhesive - Bright White | Anti-Mould, Waterproof & Paintable | 300 ml
Hemway
Hemway - Construction All-In-One Hybrid Polymer Sealant & Adhesive - Bright White | Anti-Mould, Waterproof & Paintable | 300 ml
Free Shipping
Why We Love It
  • Mould resistant and waterproof finish.
  • Specially formulated advanced polymer.
  • Environmentally friendly and odorless.
Main Highlights
  • HYBRID POLYMER TECHNOLOGY: All-in-one technology combines the flexibility of silicone, with the paintability of acrylic caulk & the high-strength seal of adhesives; ideal for construction, renovation, finishing & fixing. Hemway is a British brand and we manufacture our products to the highest standards of quality.
  • VERSATILE USE: Delivers a bright white finish on wood, glass, plastic, metal, PVC & concrete, plus compatible with water-based paints; an ideal floor, tile, bath, window, wall, door, shower, toilet, roof & gutter leak sealant..
  • ANTI-MOULD & WATERPROOF: Our unique non-shrink formula is anti-mould, waterproof, weatherproof, chemical & UV resistant, offering a durable, long-lasting finish that is resistant against fading & stains.
  • ECO-FRIENDLY: This vegan & cruelty-free adhesive & sealer is more environmentally safe than other silicone alternatives; a solvent-free, odourless, non-toxic & low VOC product.
  • QUICK CURE & HIGH COVERAGE: Covers a 6 mm bead x 9.25 mm length & fast curing within 24 hours at 23°C, with 50% R/H; provides resistance from -50°C to 120°C, making it suitable for many conditions, including high-humidity areas.
9.7
Exceptional
Amazon Logo
3
9.6
Superb
4x Bond It White WP70 Neutral Cure Silicone Sealant for External Wood, Aluminium and uPVC Door and Window Frames
Truly PVC Supplies
4x Bond It White WP70 Neutral Cure Silicone Sealant for External Wood, Aluminium and uPVC Door and Window Frames
Why We Love It
  • Flexible and weathertight design.
  • Non-fading and low odour.
  • Certified low Meko silicone.
Main Highlights
  • Flexible and weathertight
  • Non-fading and Low odour
  • Neutral cure silicone
  • Certified Low Meko
  • Conforms to ISO 11600-F&G-25LM
9.6
Superb
Amazon Logo
4
9.5
Superb
Save 9%
UniBond Fill & Repair Sealant for Indoor Use, White Acrylic Sealant, Easy to Apply, Ideal for Cracks, Gaps, Wood, Skirting Boards, Coving, Window & Door Frames, 1 x 310g Cartridge
Unibond
UniBond Fill & Repair Sealant for Indoor Use, White Acrylic Sealant, Easy to Apply, Ideal for Cracks, Gaps, Wood, Skirting Boards, Coving, Window & Door Frames, 1 x 310g Cartridge
9% OffFree Shipping
Why We Love It
  • Low odour and solvent-free.
  • Cleans with just water.
  • Over paintable in one hour.
Main Highlights
  • Easy to apply - no cartridge gun required Low odour Solvent-free Clean up with water Over paintable from 1 hour Good adhesion to most common household surfaces Colour: White Coverage: Approx. 7m
  • Good product for use
  • Easy to use
9.5
Superb
Save 9%
Amazon Logo
5
9.3
Superb
Invisible Waterproof Sealant, Anti-Leaking Clear Insulation Sealant Super Strong Anti-Leakage Agent, Repair Spray Glue Grout Sealer for Bathroom, Kitchen, Garden, Roofs & Walls (100g, 1)
Generic
Invisible Waterproof Sealant, Anti-Leaking Clear Insulation Sealant Super Strong Anti-Leakage Agent, Repair Spray Glue Grout Sealer for Bathroom, Kitchen, Garden, Roofs & Walls (100g, 1)
Why We Love It
  • Reliable in all temperatures.
  • Efficient anti-leakage protection.
  • Simple and convenient application.
Main Highlights
  • 🌡️【Reliable Performance in All Temperatures】Thisclear patio sealer resists melting in high heat and prevents cracking in cold winters. The Clear Insulation Sealant maintains its transparent appearance over time, making it suitable for long-lasting, all-weather protection.
  • ✨【Efficient Anti-Leakage Protection】The waterproof glue penetrates deep into joints and cracks, forming a transparent film that effectively blocks air, water, and moisture. This strong Anti-Leakage Agent is suitable for both indoor waterproofing and outdoor patio sealer needs.
  • 🛡️【Durable Protective Film】The bathroom sealant leak repair layer provides a resilient barrier, safeguarding surfaces from water and liquid damage. With strong adhesion, this Long-lasting Invisible Waterproof Repair Sealant ensures surfaces stay protected for years, indoors and outdoors.
  • 【Simple and Convenient Application】Easy Application Waterproof Sealant for Home use—just brush the solution onto the desired area, just brush 1 or seral times. Whether for quick fixes on cracked walls, ceilings, patio, or tiles, Clear Waterproof Insulation Coating delivers immediate results.
  • 🧱【Works on All Surface】Clear silicone sealant is designed for use on multiple surfaces, including wood, tiles, brick, marble, concrete, and roof. Filler for walls flexible formula makes it ideal as a roof sealant, Bathroom sealant, and outdoor patio sealer for versatile home repairs.
9.3
Superb
Amazon Logo
6
9.2
Superb
Save 26%
UniBond 2078170 Outdoor Window and Door Frame Sealant, White Outdoor Sealant, Durable Weatherproof Door and Window Sealant, Cartridge
Unibond
UniBond 2078170 Outdoor Window and Door Frame Sealant, White Outdoor Sealant, Durable Weatherproof Door and Window Sealant, Cartridge
26% OffFree Shipping
Why We Love It
  • Permanently flexible and durable.
  • Multi-material application usability.
  • 25-year guarantee assurance.
Main Highlights
  • Permanently flexible – Our Unibond waterproof sealant Provides a durable flexible perimeter seal for exterior window and door frames, protecting you from the elements
  • Multi materials – This durable adhesive sealant can be used on various materials such as wood, uPVC, polycarbonate, and metal - suitable for most window and door frames
  • Flexible and waterproof – As well as providing strong and flexible sealing, this window frame sealant is also waterproof, so it can stand up to harsh weather conditions
  • Long lasting – as long as you follow the instructions for use, this exterior sealant will stand the test of time, giving you peace of mind when doing outdoor sealing jobs
  • Package contents – UniBond Outdoor Window and Door Frame Sealant, weather-resistant silicone sealant, flexible and long-lasting waterproof sealant, white, Cartridge
9.2
Superb
Save 26%
Amazon Logo
7
9.1
Superb
Evo-Stik Frame Silicone Sealant, Ideal for Door and Window Frames, Highly Waterproof, Permanently Flexible, Lasts up to 25 Years, Colour: White, Size: 290ml
EVO-STIK
Evo-Stik Frame Silicone Sealant, Ideal for Door and Window Frames, Highly Waterproof, Permanently Flexible, Lasts up to 25 Years, Colour: White, Size: 290ml
Why We Love It
  • Permanently flexible for 25 years.
  • Excellent weatherproofing abilities.
  • Suitable for interior and exterior.
Main Highlights
  • Low modulus, neutral cure silicone sealant, For use in properly designed high movement joints, especially around door and window frames
  • Results: Permanently flexible seal, High movement accommodation, Excellent weatherproofing abilities, Dries in approx. 10-20 minutes
  • Suitable for all types of frames including aluminium, hardwood and uPVC, For interior and exterior use
  • Bonds to most building surfaces without a primer, Robust seal – Lasts up to 25 years
  • Contents: 1x EVO-STIK Frame Silicone Sealant, Ideal for Door and Window Frames, Highly Waterproof, Permanently Flexible, Lasts up to 25 Years, Colour: White, Size: 290ml
9.1
Superb
Amazon Logo
8
9.0
Superb
Save 11%
EVO-STIK Window & Door Frame Sealant, Waterproof, Flexible, Overpaintable, Lasts up to 15 Years, Colour: White, Size: 290ml
EVO-STIK
EVO-STIK Window & Door Frame Sealant, Waterproof, Flexible, Overpaintable, Lasts up to 15 Years, Colour: White, Size: 290ml
11% OffFree Shipping
Why We Love It
  • Weatherproof and reliable protection.
  • Excellent adhesion to surfaces.
  • Mould-resistant and overpaintable.
Main Highlights
  • EVO-STIK Window & Door Frame Sealant, Filled acrylic emulsion paste ideal for sealing around door and window frames
  • Weatherproof: prevents damage caused by penetration of water and keeps out draughts
  • Excellent adhesion to most materials including wood, uPVC and metal, For interior and exterior use
  • Lasts up to 15 years, Contains fungicide to combat unsightly mould growth, Overpaintable when dry
  • Contents: 1x EVO-STIK Window & Door Frame Sealant, Waterproof, Mould-Resistant, Flexible, Overpaintable, Colour: White, Size: 290ml
9.0
Superb
Save 11%
Amazon Logo
9
8.9
Excellent
SX Clear PVCu Silicone 300ml - Neutral Curing - Window and Door Frame Sealant - Indoor and Outdoor - UV, Water and Moisture Resistant
Siroflex
SX Clear PVCu Silicone 300ml - Neutral Curing - Window and Door Frame Sealant - Indoor and Outdoor - UV, Water and Moisture Resistant
Free Shipping
Why We Love It
  • Fast curing, durable seal.
  • UV resistant for external use.
  • Water and moisture resistant.
Main Highlights
  • FAST CURING - Skin Formation In 10 Mins Curing Through Atmospheric Moisture Forming A Durable Rubber Seal Within 24 hrs
  • UV RESISTANT - Perfect for external Use On Windows In Particular Most PVC Window Frames
  • WATER AND MOISTURE RESISTANT - Creating a Durable Rubber Seal to Hold Out Rain and Water Ingress
  • MULTI PURPOSE - Ideal for perimeter pointing of window and door frames, sealing plastic roof-line areas and general weather sealing.
  • CONTENTS - 1 x Siroflex SX Contractors PVCu Silicone 300ml Colour - Clear
8.9
Excellent
Amazon Logo
10
8.8
Excellent
UniBond Indoor Window & Door Frame Sealant, White Acrylic Sealant, Paintable from 1 Hour, 1 x 467g Cartridge
Unibond
UniBond Indoor Window & Door Frame Sealant, White Acrylic Sealant, Paintable from 1 Hour, 1 x 467g Cartridge
Free Shipping
Why We Love It
  • Mould resistant for longevity.
  • Flexible and adheres well.
  • 5-year guarantee included.
Main Highlights
  • Water-based paintable sealant that is suitable for many sealing tasks around your home
  • Flexible and adheres to most building materials
  • Suitable for interiors use skirting boards, dado rails, coving, worktops and wooden rails
  • Mould resistant
  • 5 year guarantee (provided good working practices are followed)
  • Note Not suitable for Exterior, Wet Areas, uPVC Windows, Bedding Components, Bathrooms
8.8
Excellent
Amazon Logo