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 Is this product good for adhering to wood. I'm looking to waterproof a 1/2 whiskey barrel for ponding ? How long does Liquid Rubber Waterproof Sealant take to cure? Does the product have a detrimental impact to fish or aquatic plants? How should I prepare the surface before applying Waterproof Sealant? Can Waterproof Sealant be put on tarred surfaces? Comments 0 comments Article is closed for comments.