This product truly makes the surface of your projects as hard as stone---if you add Boost Liquid Fortifier to your foam coating project, make sure you have it just as you want it before it dries! Thanks HWFF!
This is a great weatherproof sealer for outdoor foam projects. I used to coat a mardi gras float before spray painting it with an acryllic paint and then handpainting details. It is a bit gritty like stucco, and I was worried the grit would shed after it was dry, but it didn't budge.