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? Can Waterproof Sealant be put on tarred surfaces? Does the product have a detrimental impact to fish or aquatic plants? How come it feels tacky? Is it cured? Comments 0 comments Article is closed for comments.