question about my DIY concrete/foam background - The Planted Tank Forum
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post #1 of 5 (permalink) Old 12-05-2015, 09:42 PM Thread Starter
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question about my DIY concrete/foam background

Hey guys,

So a few days ago, i made a foam background and painted it with quick drying concrete. at first it looked awesome, however it started to chip really fast, I can just brush over it with my hand and have several chips of concrete falling to the bottom of the tank.

Does anyone know how to fix this? Drylok and quikrete aren't available in my country so dont suggest those :P

Considering it was a pretty large background and took me several hours and several cement bags, i'd rather not start all over either..

thanks in advance!

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post #2 of 5 (permalink) Old 12-06-2015, 02:30 AM
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The answer is some type of sealant. There's something available in your country, you'll just have to find it. At the very least, you can use a fiberglass based resin, the type that people use on cars and boats.

I made a concrete background myself with no sealant. It still looks great - I put about 4 coats on it, although I barely used 1/2 a bag of concrete, so yours must be HUGE if you used 5 bags. I can see a few spots where mine has chipped off (its been installed for about a year), but those are hard to reach spots where I know I didn't put very much concrete. For the most part its held up very well. I used mortar for mine that was advertised as quick drying and adhering to many surfaces.

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post #3 of 5 (permalink) Old 12-07-2015, 02:09 AM
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Give it a fresh coat of concrete and then press a nylon netting (bug proof nets) over the fresh coat and give it another coat over the net before the one under dries.

Before starting - first trim the sheet of net you are going to use - removing the excesses of folds by cutting them off leaving only a small overlap - you will not have the time once you start.

When you drape the net over the fresh coat - smooth it against the fresh coat firmly so that it sticks to that surface. Don't make the coats very thick - just thick enough to cover the surface.

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post #4 of 5 (permalink) Old 12-07-2015, 03:24 PM
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I used tile glue with extra flexibility for heated floors. Never had any problems.
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post #5 of 5 (permalink) Old 12-07-2015, 05:38 PM
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They make polymer grout for tiles you can use. It comes in several colors.

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