FLEX PU-40 is a one-component, solvent-free, elastomeric adhesive and sealant providing:

• Resistance to temperatures ranging from -40 oC to +100 oC. 
• Excellent bonding to any kind of building material.
• High elasticity.
• Great resistance to aging and weather.
• Overpaintability after hardening, only with water-based paints.

FLEX PU-40 is suitable for sealing vertical and horizontal joints, on various materials such as concrete, aluminium, steel, wood, glass, natural and artificial stone, etc., both indoors and outdoors. Also suitable for bonding these materials. In case of grouting on natural or artificial stones, such as marble and granite, please contact ISOMAT’s Technical Support Department.

Substrate preparation
Substrate must be dry and free of dust, loose particles, grease, etc. It is recommended that the joint is cleaned up by using a paintbrush or a wire brush and then air-blasted. To avoid undesirable soiling at joint edges, a self-adhesive paper tape is applied alongside the edges and then removed immediately after sealing the joint (before a film is formed).

Application
The cartridge is inserted in the special gun and the nozzle is cut slantwise, so that it does not fit into the joint but barely touches and slides along the edges. FLEX PU-40 is applied by moving the cartridge along the joint axis at a 45o angle. While still fresh, the sealant is leveled with a trowel.