Can Waterproof Sealant be applied to Styrofoam? Yes, all the products are water based containing no solvents or VOC's. It can be applied to Styrofoam. Related articles Can Waterproof Sealant be put on tarred surfaces? What is Liquid Rubber MetalSafe Sealant used for? Is this product good for adhering to wood. I'm looking to waterproof a 1/2 whiskey barrel for ponding ? Can the Earlex Sprayer spray the Original Black Waterproof Sealant? How do I cover gaps and cracks? Comments 0 comments Please sign in to leave a comment.