Bituminous primer composed of oxidized bitumen and technical solvents. The product has a fast curing time, excellent penetration and adhesion to the substrate and absence of superficial tackiness. PRIMERTEC is used to block superficial dust and porosity of both flat and sloped concrete and metal surfaces, allowing the application of the polymer bitumen membrane without loss of time, for both torchon and cold bond applications. The product is also used as a waterproof paint on foundation walls, as a fixative consolidating primer on cement, wood and metal surfaces and for the protection and waterproofing of tubes, metal tanks both exposed and buried.