Zinsser allcoat exterior primer finish is the best performance all surface paint designed for the long term decoration of timber metal masonry plastic concrete cladding and more it forms a vapour permeable low maintenance water shedding coating re coatable in 1 hour allcoat exterior contains a biocide to protect the dried coating against fungal degradation designed for all exterior surfaces allcoat exterior is ideal for new or previously painted wood upvc galvanising metals cladding weathered