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 do I cover gaps and cracks? How long does Liquid Rubber Waterproof Sealant take to cure? What if I see blisters? Can Liquid Rubber Products be used in Drinking or Potable Water situations? Comments 0 comments Article is closed for comments.