Any easier ways? 1. When foam insulation is installed on walls, sanding is not necessary. Step 2 - Choose Supplies and Prep. Basically I got 3 for the price of 1, all premium paint. Then the paint roller should be coated evenly with the paint. The sanding of the foam insulation is only essential when doing craft work or decors. Hi all, I've watched a few of BMC's videos on creating terrain with XPS foam. Yes its a weak foam compared to your structural foam cores for hulls and things but you can find many uses for it in other places on boats besides a hull. Painting XPS rigid foam board (Kingspan GreenGuard) [there doesn’t appear to be a way to post j text in this forum but basically I j want to know how I can paint XPS] Close. I have heard that acrylic paint can seal it, but I just wanna double check. I have painted over finished boards using the same plastics paint many times. I need to know of an easy way to seal polystyrene, or insulation foam. I won't be able to side it until next year, leaving the foam exposed to sun and elements. Watched your shaping video, and I have a couple of comments. I have used paint that is for plastics (rattle can from hardware store) and it didn't melt the foam, but I only used it to get my outline. This is my first project using these materials so I have a lot to learn. Hoping to hear from those with experience carving XPS foam forms/dioramas intended to withstand the elements, or even better, forms/dioramas specifically designed to support a working water feature. Posted by 3 days ago. Put your gesso or latex paint into a paint tray. You can paint polystyrene foam or expanded polystyrene beads using a waterborne paint to protect it from solvent attack by subsequent coats of paint. Hi : Being new doesn't mean I can't be helpful . I haven't tried glassing over painted XPS or EPS foam. XPS can be a very useful material - it shouldnt be given such dismissal so easily as the forum members here like to do. There are multiple types of foam, but they all have a similar weakness with a similar solution. Is it advisable to coat it with a latex paint or housewrap? OC Help. For me personally, one of my least favorite things to do is base coat or paint multiple large surfaces by hand. Now , that said I get my products at Hobby Lobby cause it's closest and the products they sell can be used on model railroads. The gesso acts as the primer. I put on a house addition with XPS on the exterior. Spray coating / painting XPS foam. He mentions that one of his least favorite things to do is draw brick lines. Go to Home Depot (any bix box store) and check the paint department for discards or returns. Typical waterborne paints are acrylic or vinyl lattices used for painting building interiors and exteriors or water-soluble industrial paints. 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