would any glue/grout/varnish be OK to use if it was left to air for a couple of weeks?
If not can you tell me the ones you've used in your vivariums, thanks.

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i sent soemone out to get me grout and they got me a ready mixed glue and grout...whcih i sent back.

dry grout stuck on with pva glue is safe when dry of course.

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Joan was quizzical, studied pataphysical
Science in the home
Late nights all alone with her a test tube
Oh, oh, oh, oh
Maxwell Edison, majoring in medicine
Calls her on the phone
"Can I take you out to the pictures Jo-o-o-oan?"
But as she's getting ready to go
A knock comes on the door

Bang! Bang! Maxwell's silver hammer
came down upon her head
Clang! Clang! Maxwell's silver hammer
made sure that she was dead

Back in school again Maxwell plays the fool again
Teacher gets annoyed
Wishing to avoid and unpleasant scene-e-e-ene
She tells Max to stay when the class has gone away
So he waits behind
Writing fifty times "I must not be so-o-o-o
But when she turns her back on the boy
He creeps up from behind