Bituminous Emulsion Primer and Waterproof Protective Coating

The term "app primer" typically refers to APP (Atactic Polypropylene) Bitumen Primer, a specialized cold-applied liquid coating used in construction to prepare and seal concrete, metal, or wood substrates before torching on waterproofing membranes. Alternatively, it can refer to APP Auto-Plast Produkt, a well-known brand of automotive refinishing primers, fillers, and sprays.