Bituminous Felt Adhesive is a cold applied, solvent-borne bituminous adhesive for bonding all types of roofing felt. It is suitable for use over asphalt, felt and metal, although it should not be used over tar based products. Bituminous Felt Adhesive should be applied to a clean, dry, dust free surface using a mop, squeegee or stiff brush. Allow the adhesive to become tacky, then lay the felt onto the adhesive and roll as recommended. Dusty or porous surfaces should first be primed with Penetration Primer. It is recommended that when laying felt onto timber or wood substrates, the first layer of felt is nailed with galvanised clout head nails. Subsequent layers can be bonded with Bituminous Felt Adhesive. Always tape joints in timbers and concrete before over lapping with felt.