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Old 08-07-2011, 04:46 PM   #1
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concrete comes right off

So, I tried doing that thing where you use Great Stuff expanding foam for the background on a tank, and then you "paint" it with cement. After it dries, though, it comes right off when I rub it with my finger. This is even after a few coats. I'm not sure what I'm doing wrong. Is this common?

edit: The title is meant to say "cement," not concrete.

Planning my paludarium
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Old 08-07-2011, 05:22 PM   #2
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First coat needs to be really thick and the surface can't be to smooth or it won't stick.
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