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i just built my viv which is 7ft by 4ft by 20ins out of ply and to waterproof it i used b&q indoor quick dry varnish. its about a fiver for 250ml. this advise i got from gaz and it has worked perfectly. hope this is of some help to you

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I've heard that yacht varnish is the best stuff to use but never tried it myself - they sell it in Focus.

i can only say that it works well in my viv for my boa so maybe in your case the yacht varnish would be a better option

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My Gang2.2 Common Boas1.1 Salmon Boas het albino1.1 Suriname Red Tailed Boas0.1 Guyanan Red Tailed Boa1.0 Western Hognosed Snake1.0 Dogue de Bordeaux1.0 Staffordshire Bull Terrier1.1 Sugar Gliders

I'd go with yacht varnish but not sure about the fumes you will get.

Just let it air for a while then I'd put the glass back and turn the temps right up then after an hour or two stick your head in and see if it smells or not.

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1.0.0 Jungle Carpet Python, Brian (CB 06)
1.0.0 Lodger, little Bro (CB 81)