Our Commercial 100% Silicone Sealant is permanently flexible and is designed for use in coves, corners, changes in plane and expansion joints associated with exterior or interiors applications of tile and stone. Can be used in pools and other wet applications. Conforms to ASTM C-920, Type S, Grade NS, Class 25, Use T, NT, A, I, M and G, ASTM C1248 and ASTM C-794 properties. Meets or exceeds TCNA EJ171 Movement Joint Guidelines for Ceramic, Glass & Stone. This product was previously named Commercial 100% Silicone Caulk.
Application of ProductSealant should be installed after grout has cured. Joints and surfaces should be clean, dry and free of all contamination including old caulk or other sealants. Backup strips shall be flexible and compressible type of closed-cell foam polyethylene, butyl rubber, or urethane. Backup strip should fit tightly in the joint and to a depth that allows the sealant depth to be 1/2 the thickness of the tile. Cut tip off nozzle on a slant to desired opening size. Completely fill joints with sealant.
Smooth or clean off excess sealant with mineral spirits or paint thinner before sealant cures. After cure, remove excess with a razor blade.
Toolstation Silicone Mastic
Do not apply when temperatures fall below 40°F (4°C). IMPORTANT: Commercial 100% Silicone Sealant is not a paintable surface. Painting should be done prior to installation.
The best working position is to hold the sealant gun at an angle of 45° and to pull the gun towards yourself. To apply the sealant neatly you need to find the right working speed. If you move too slowly you’ll get a bumpy, irregular sealant surface, and you’ll waste sealant unnecessarily. If you move too quickly you won’t get good filling of the gap. When you reach the end of the seam release the handle and press the button or lever at the back of the sealant gun. This releases the pressure so the flow of sealant stops immediately. If you don’t do this the sealant will keep coming out of the nozzle.
Finishing off the sealant line.