Inter-Prime® Wood Sealer Clear is specially formulated to seal the grain and stop varnish from soaking into the wood. This allows future coats of varnish or paint to dry without high and low spots. it's particularly good for sealing plywood to resist cracking and checking. Specially formulated to seals the grain and stop varnish from soaking into the woodit's suitable for either interior or exterior useParticularly good for sealing plywood to resist cracking and checking