Intergrain UltraPrep Sealer & Primer is a high performance sealer and primer formulated to be compatible with all Intergrain waterbased top coats. Intergrain UltraPrep Sealer & Primer seals bare and coated timber surfaces, locking in any previous water or oil based timber coating and allowing the application of any Intergrain water based coating over the top. Intergrain UltraPrep Sealer & Primer will also extend the life of any Intergrain water based top coat when applied underneath.