Re: Sealing wood for basking spot.
Varnish, when baked at 100F for 12-14 hours a day, has the potential to release more toxins than just the heated plywood. Anyone concerned about the potential release of toxins from plywood should avoid varnish as well. Thin layers of solid hardwoods or natural slate floor tiles would be better options. The slate would probably be the more available route.
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