Back about eight years ago I dissolved a tube of silicone caulk into a gallon of turpentine and painted a papercrete panel with it. The theory was that even if the sun degraded the silicone it would only do so on the outer skin, and this thin mixture penetrated about 1/2" into the pc. That panel laid around through a couple of monsoon seasons and always seemed to shed water like a duck's back. At some point a helper decided it was scrap and threw it into the mixer where it was recycled into another project.
Another successful test was asphalt emulsion mixed into the pc while it was still wet. That panel set up normally and then was waterproof enough to float for eight hours without absorbing any water.
Spaceman
Vincent Pawlowski wrote:
I encourage people to try things, even those that have been tried before. They might work differently in your case. Thanks, Vince
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