Zinsser B-I-N White Matt Primer sealer 2.5L. Apply this primer sealer from Zinsser to interior porous surfaces even bleeding knots & sap streaks as well as water stains fungal degradation nicotine oil stains marker pen stains & more using a brush or roller to prepare the surface for painting. It seals primes blocks stains & kills odours. It takes 15minutes to dry & will cover up to 12 m² per litre on average.