Lenmar 1C.5300 MegaVar Catalyzed Vinyl Sealer is a versatile, non-yellowing, catalyzed sanding sealer. Once catalyzed, this fast-drying sealer offers an exceptional amount of solids for initial build, seals and fills most porous wood species in a single coat, and sands easily. This sealer can serve as an excellent foundation for use under any of Lenmar pre-catalyzed lacquers or conversion varnishes. Lenmar 1C-5300 catalyzed sanding sealer requires the addition of 4 ounces of 1A-622B Catalyst (3%) per gallon. Once dry, the sealer should be sanded with 320-grit sandpaper. Only catalyze the amount of sealer that will be applied in an 8-hour period.