Just a small hijack to the thread.
I have used Hydrocal plaster (not CP) over mesh, or even drywall "mud" and screed it to about 1/8 inch to 1/4 inch thick. Sand as smooth as you can and apply a single layer of GRP cloth and finish using fillers, etc. Way away (I also use sprayed-on PVA for "belt and suspenders" mold release. Lots of time spent.
|