Gaps round windows and joints
One-part sealants that stay flexible in sun and rain.
Scroll to see each layer go on, or pick a layer.
Ask for a Site TrialThe system, step by step
Each product in the order it goes on. Open a product for how to mix and apply it.
- 1 PU25 Polyurethane Multi-purpose Construction Joint SealantHow to Apply
One-part polyurethane sealant that cures with moisture in the air into a flexible, strong joint.
- 2 DS-792 Weatherproofing Silicone SealantHow to Apply
Low-modulus, one-part silicone made for joints in new buildings.
- 3 M7 Modified Silicone SealantHow to Apply
Neutral-cure, one-part, medium-modulus sealant that can be painted over with water-based paint.
The grouping and order follow our reading of the Aftek catalogue systems; our technical person confirms them for your site before work starts.
Products in this system
PU25 Polyurethane Multi-purpose Construction Joint Sealant One-part polyurethane sealant that cures with moisture in the air into a flexible, strong joint. 310 ml cartridge, 600 ml sausage 
DS-792 Weatherproofing Silicone Sealant Low-modulus, one-part silicone made for joints in new buildings. 300 ml cartridge (25 per box), 600 ml sausage (20 per box) 
M7 Modified Silicone Sealant Neutral-cure, one-part, medium-modulus sealant that can be painted over with water-based paint. 300 ml cartridge Other jobs
Leaking terrace or roofScreed, a waterproof membrane, then a heat-reflecting finish.Bathroom or kitchen tilingWaterproof the floor, fix the tiles, fill the joints, seal round fittings.Factory or warehouse floorPrimer, a self-levelling middle coat, then a hard-wearing top coat.Cracked or broken concreteBond new to old, rebuild the surface, fill voids solid.Damp outer wallRender the wall, then a clear coat that makes rain run off.