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 come it feels tacky? Is it cured? What if I see blisters? Comments 0 comments Please sign in to leave a comment.