What is the difference between acetoxy and neutral cure silicone?

Acetoxy cure silicone releases acetic acid (vinegar smell) as it cures. It bonds well to glass and glazed ceramics but can corrode metals and stain marble or natural stone. Neutral cure silicone (like the Bond It WP70) releases no acid during curing, making it safe for metals, plastics, coated surfaces and alkaline substrates like concrete and plaster. For window and door frame sealing, neutral cure is the correct choice because it won't attack the frame material or surrounding masonry.

What does low modulus mean in silicone sealant?

Modulus refers to how stiff the cured sealant is. Low modulus (LM or LMN) silicone remains very flexible after curing, typically accommodating 12-25% joint movement. This is essential for external perimeter seals around windows and doors where thermal expansion causes the joint to move throughout the day. High modulus silicone is stiffer and better for applications where minimal movement is expected, like internal glass-to-glass bonding. For frame sealing, always use low modulus.

How long does silicone sealant take to cure?

Most professional silicones skin over in 15-30 minutes and cure at approximately 2-3mm depth per 24 hours at room temperature (23 degrees, 50% relative humidity). A standard 10mm joint takes roughly 3-4 days to fully cure through. Cold weather, low humidity and deep joints all slow curing. Avoid tooling or disturbing the joint for at least the first 3 hours. Do not apply silicone below 5 degrees as it may not cure properly.

Can you paint over silicone sealant?

Standard silicone sealant cannot be painted. Paint will not adhere to cured silicone and will peel or crack. If you need a paintable seal, use an acrylic sealant or a hybrid polymer sealant like CT1 or OB1, which accept paint after curing. Some decorators' caulks are also designed specifically to be overpainted. If you've already applied silicone and need to paint, the only option is to fully remove it and reapply with a paintable product.

Which silicone colour should I use for uPVC window frames?

Match the silicone to the frame colour. White is the standard for most uPVC installations. Clear works well for glazing and visible joints where you want the sealant to disappear. Grey matches increasingly popular anthracite and slate grey frames. Black suits modern dark frame profiles. Brown is the right choice for woodgrain-effect uPVC and natural timber. The Bond It WP70 is available in white, clear, black, brown and grey, all with UV-stable colour that resists fading.

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Bond It Roof-Mate Roof & Gutter Sealant 310ml - Black

Brand Bond It Part No. BDGR

Bond It Roof-Mate Roof & Gutter Sealant - Black 310ml

Bond It Roof-Mate is a polymerically reinforced lap jointing sealant and adhesive designed to prevent leaks in gutters, downpipes, and general roofing applications. It forms a flexible seal capable of accommodating up to 5% movement and remains flexible for up to 15 years.

Roof-Mate can be applied in wet conditions, even during heavy rain, which makes it a practical choice for emergency roofing repairs. It maintains a permanently putty-like consistency beneath its surface skin, with high solids formulation providing excellent gap-filling properties without shrinkage.

It is suitable for use on metal, construction-grade plastics, painted surfaces, stone, timber, brick, bitumen, and asphalt. Available in black only, it blends naturally with most roofing materials.

Key Features

Polymerically Reinforced - improved adhesion over standard butyl sealants
Works in Wet Conditions - can be applied in heavy rain for emergency repairs
15-Year Flexibility - remains permanently flexible with up to 5% movement capacity
High Solids Formulation - excellent gap filling without shrinkage
Wide Material Compatibility - metal, plastics, stone, brick, bitumen, asphalt, and timber
Semi-Drying - remains permanently plastic beneath the surface skin
310ml Cartridge - standard cartridge for skeleton gun application

Bond It Roof-Mate Roof & Gutter Sealant - Black 310ml

Bond It Roof-Mate is a polymerically reinforced lap jointing sealant and adhesive designed to prevent leaks in gutters, downpipes, and general roofing applications. It forms a flexible seal capable of accommodating up to 5% movement and remains flexible for up to 15 years.

Roof-Mate can be applied in wet conditions, even during heavy rain, which makes it a practical choice for emergency roofing repairs. It maintains a permanently putty-like consistency beneath its surface skin, with high solids formulation providing excellent gap-filling properties without shrinkage.

It is suitable for use on metal, construction-grade plastics, painted surfaces, stone, timber, brick, bitumen, and asphalt. Available in black only, it blends naturally with most roofing materials.

Key Features

Polymerically Reinforced - improved adhesion over standard butyl sealants
Works in Wet Conditions - can be applied in heavy rain for emergency repairs
15-Year Flexibility - remains permanently flexible with up to 5% movement capacity
High Solids Formulation - excellent gap filling without shrinkage
Wide Material Compatibility - metal, plastics, stone, brick, bitumen, asphalt, and timber
Semi-Drying - remains permanently plastic beneath the surface skin
310ml Cartridge - standard cartridge for skeleton gun application