Toy-Block-Painting Published November 23, 2012 at 375 × 218 in How to Seal Coat and Paint Toy Blocks with Zinsser for an Even Finish Before painting, the blocks are immersed in Zinsser SealCoat and dried on needle board. The solid-wood blocks that make up the puzzle were immersed in Zinsser ® SealCoat ™, allowed to dry on the needle board and then painted.