Many sealants can be painted over soon after they have a firm skin on the surface that is not damaged with the pressure of a paint brush. The time it takes to achieve a firm skin varies with different sealants. All paintabe sealants are best over painted with water based paints first to create a barrier before applying an oil based paint. Some paints (varnishes, solvent based lacquers) are suitable to paint directly on to the sealants. Hint: Early painting can slow down the full curing / drying of the sealant.