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Old 10-29-2009
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Originally Posted by elliottrt View Post
My current plan is to cut another plywood lid, and coat it with fiberglass resin to waterproof it. ......... Any thoughts?
Hope that you are NOT exposing the lid or any of the tanks FIBERGLASS surfaces to your water. The 'leachables' from styrene monomer, etc. into drinking water is VERY unhealthful.

For health and safety you should consider an non-amine blush epoxy that is EPA/NSF **RATED** for potable water service.
NSP Specialty Products Inside this website look for NSP-120, is certified to NSF/ANSI Std. 61 (Drinking Water System Components)
I use NSP-120 and find that if warmed up so that its viscosity is lessened, you can apply a proper coating with a simple WEST SYSTEM type epoxy roller; the higher temp also means a shorter 'pot life' before 'kicking'.

Interlux (Commercial Division) plus the other larger coatings manufacturers also make such 'potable water contact' grade of epoxies - but offer only inn large quantities.
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I was worried about the same thing (toxicity) with bedding/sealing compound for the inspection plates (or resealing the lid if it is necessary). Any pointers to a food contact grade sealer?

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Don't use 101 - it breaks down in water. I don't think any of the 3M is certified but Dow Corning has 999A clear silicone.
PSC 31 #84
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