Sealants and sealant kits are widely used by both hobbyists and professionals for a broad range of protecting and waterproofing jobs. The best sealant type to use in a given scenario will depend on the surface materials and the location of the seal. There are many varieties of sealants, putties, and sealant remover kits on sale, with leading brands including Dow Corning and Bostik. While most tend to fall within one of a few basic categories - cement sealants, chemical sealants, or silicone sealants - there are also a number of sealants designed for more specialised purposes.

What’s the difference between sealant types?

Silicone sealants - among the most widely available sealant types, and ideal for a wide array of household, DIY and construction tasks.

Acrylic sealants - often a cheaper alternative to silicone for use on wood, aluminium, and UPVC, and can also be painted. They’re less flexible than most silicone versions, and more prone to eroding under certain application conditions.

Polyurethane foam sealants - extremely flexible/elastic and highly waterproof, ideal for sealing most metals and fibreglass.

Why is sealant modulus and cure type important?

High modulus sealants are less elastic but more hardwearing, and better suited to indoor applications as a kitchen or bathroom sealant (around baths, showers, sinks and worktops).

Low modulus sealants offer better flexibility and adhesion where slight movement of the joint may be a factor, but are less hardwearing overall. They’re generally best for outdoor and weather-resistant applications (perimeter seals and exterior UPVC).

Most sealants are available in one of two cure types - acetoxy and neutral.

  • High modulus sealants tend to be acetoxy cure, meaning they’ll cure faster and harder, and will emit a slight vinegar smell while doing so.
  • Low modulus sealants are often sold in natural cure variants, meaning they adhere better to a greater range of surfaces, cure slowly to a more elastic consistency, and give off little odour.

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Description Price Colour Sealant Type Application Package Size Package Type Minimum Operating Temperature Food Processing Safe Maximum Operating Temperature Chemical Type Physical Properties Trade Name Cure Time Product Form Chemical Composition
RS Stock No. 258-5957
Mfr. Part No.5367, 310ML
White Silicone Sealant Bonding 310 ml Cartridge -60°C No +250°C Acetoxy - Loctite 5367 - Paste -
RS Stock No. 341-0961
Mfr. Part No.91361
Transparent Silicone Sealant Exterior, Sealing 300 ml Cartridge -50°C No +180°C Acetoxy, Elastomer Acetoxy Cure, High Modulus Bond-Flex 100HMA 24 (2 mm h @ 23 °C) Non-Slump Paste -
RS Stock No. 901-5679
Mfr. Part No.740010650
White Silicone Sealant Engineering 310 ml Cartridge -60°C No +300°C Elastomer High Temperature, Tack-Free - <12 (3 mm) h Liquid -
RS Stock No. 459-0226
Mfr. Part No.6011087
White Silicone Sealant Refrigeration Units 310 ml Cartridge -50°C Yes +150°C Acetoxy High Modulus 786 24 (2.5 mm) h Paste -
RS Stock No. 561-160
Mfr. Part No.2939193
White Silicone Sealant Sealing 310 ml Cartridge -40°C No +150°C Acetoxy Non-Flammable Geobond Marine 24 (3 mm h @ 23 °C) Paste -
RS Stock No. 264-1041
Mfr. Part No.483439
White Silicone Sealant Exterior, Sealing 310 ml Cartridge -50°C No +120°C Acetoxy High Modulus - 24 (6 mm) h Paste -
RS Stock No. 787-7438
Mfr. Part No.5375
Transparent Silicone Sealant Bonding, Sealing 310 ml - - No - Silicone Flexible Loctite 5375 - Paste -
RS Stock No. 512-783
Black Silicone Sealant Jointing 310 ml Cartridge -50°C No +100°C Elastomer Low Modulus, Neutral Cure - 7 (23 °C) days Paste -