Primer

The membrane is only as good as what’s under it. Dusty blockwork, chalky render, dense concrete, lime plaster — difficult substrates are where coatings fail. The right primer gives your airtight or waterproof membrane a surface it can grip for the life of the building, and gives plaster something to hold onto over the top.

Three primers cover the range: Primer IM, the all-round render and substrate primer for porous or dusty surfaces before airtight coatings; Lime Prime, the bonding primer for lime renders and breathable heritage build-ups; and Supergrip, the high-grip key that gets plaster and dot-and-dab to stick to cured airtight membranes — and membranes to stick to smooth ICF and concrete.