DIY Alpine Trough - Update + Water Test - August 2026
A week or so ago, I debuted the initial build of my (DIY) Alpine trough wasserspiel (water feature) that I created out of a Styrofoam cooler and Vinyl Concrete Patch. I built up a few layers of the concrete patch and tried to age it/paint it to make it appear more stone-like in appearance. On top of that, I then applied a heavy-hand of spray waterproofing. I chose Gorilla Brand Waterproof spray. And...it turns out....spray waterproofing (with some sort of 'solvent' in the mix that allows it to be propelled as a spray, I think??) EATS AWAY at foam. In this case, a Styrofoam cooler. I sprayed the waterproofing on all sides - inside and out. And, then, I tucked it away in the garage to await the '24 hour curing period'. My plan was to then water-test it. When I grabbed it out of the garage, I noticed something. One of the inside corners looked different. It was soft and 'eaten away'. Ugh. I guess I didn't ...