Primer W is a high‑performance water‑based bituminous primer formulated to prepare concrete, masonry, and cementitious substrates prior to the installation of torch‑on bituminous waterproofing membranes. Its aqueous emulsion penetrates deeply into porous surfaces, sealing dust, reducing porosity, and creating a strong bonding layer for APP and SBS modified membranes.
Because Primer W is non‑flammable, odourless, and solvent‑free, it is especially suitable for residential areas, enclosed spaces, and sensitive environments where solvent‑based primers are not recommended. The product offers excellent adhesion, good penetration, and fast drying times under normal conditions, ensuring efficient workflow for contractors.
Primer W can be applied using a brush, roller, spray, or scrubbing brush, making it versatile for various site conditions. It is also compatible with slightly damp concrete surfaces and can be mixed with cement to create a leveling mortar when required. Its frost‑sensitive formulation requires proper storage and application under suitable weather conditions.
