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Discussion Starter · #1 ·
I've recently started building a DYI 3D rock background for my new 46g bowfront. Curently I'm waiting for the second coat of cement to dry before applying the final coat.

The materials I used were:

1.5 inch foamboard
quickcrete hydraulic water-stop cement
quickcrete cement colour pigment's
100% GE silicon

Pictures will come soon, have them but cant upload at the moment.

SO MY MAIN QUESTION: I want to seal the cement with a clear coat that will insure that the cement will not degrade, leach out chemicals, leach out colour pigment ect.

What is a safe sealent to use to coat the cement background?[/img][/code]
 

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I imagine clear epoxy would be the only thing "safe" to use to clear coat it, but I've never heard of this being done either. Most people who have used concrete pre-soak the BG in water until the concrete stops raising the ph of the water. This will require frequent water changes for a few weeks, and a high range ph test kit.
 

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Discussion Starter · #4 ·
Yeah I'll be soaking it also, but dosnt cement degrade after a while? Wont it start chipping off the styrofoam?
 

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Yes, but they're thick- similar to fiberglass. The Pond Shield Epoxy can be diluted a little but it's still going to give you a thick coat.
 
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