My son and I are in the middle of building a Jurassic Park Explorer (exactly like the 1 from the movie) and I am currently focused on the roof. I’ve made a mold out of Styrofoam and have just put the 1st coat of USG Eazysand over the whole thing. I want to finish off the plug with Plaster of Paris because it is much harder and can handle the heat & pressure of a ¼” thick sheet of 350° Acrylic being thermally draped over the top of it. My question is what do I need to do to make sure the Plaster of Paris adheres to the USG Easysand? In my 1st attempt at this, I only used PoP – final sanded the first coat with 40 grit paper- but because I didn’t know what I was doing, the 2nd coat did not adhere to the 1st coat and completely cracked back off. This time I opted to use the easysand for it’s lengthier work time, but I need the final coat to be PoP. Do I just rewet the surface of the easysand or do I need to roll on a bonding agent? If so, what kind? Thanks, Greg
Two factors should be considered for this job: undersized ceiling joists and an air-conditioning unit that must be level to drain properly.
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