Silicone performs best in exterior, high-movement, or UV-exposed conditions. It resists shrinkage and remains permanently flexible. Unlike acrylics or some PUs, it does not degrade under sunlight or temperature swings — making it ideal for windows, glass, metal flashing, building panels and curtain walls.

• When the sealant needs to be painted — polyurethanes, acrylics or hybrids are better.
• On asphalt or bituminous surfaces, where chemical incompatibility can occur, except for specialized silicones e.g. Dowsil 890SL.
• When bonding to porous surfaces without primer, hybrids or PU will adhere better than an acetoxy silicone. Neutral-cure silicones are recommended for porous substrates.

Backer rod is available in diameters typically ranging from 1/4″ to 6″ (6 mm to 150 mm). The rod should be 25% larger than the joint width to ensure it stays in place without adhesive.

Keep the product in its original packaging along with all documents confirming the purchase and refund. You will need this for further communication with the seller and the payment system.