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 Does the product have a detrimental impact to fish or aquatic plants? 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? Comments 0 comments Article is closed for comments.