Bituminous. solvent-based adhesive made with selected bitumen and resins, solvents and inert minerals formulated specifically for the head overlaps of self-adhesive slate polymer-bitumen membranes. It contains special resins that increase the bonding power with respect to normal bituminous adhesives and fast evaporating solvents that let the product dry fast. The indicative consumption of the product is of about 0,8-1 kg/mē.