I am using corian as a surface for my tub/showwe, I have the corian adhesive to glue the joints together. My question is the underlament, pronably going to use wonderboard over plywood. If I use a bed ofrubberbased silicone or 100% silicone will this make the bed waterproof? I have had several different opinions and want a long lasting waterproof solution. I have read in your responses, 100% silicone, Liquid Nails, etc. Please advise, Thank you very much
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