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Old 02-26-2014, 09:10 AM   #11
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You can skip the cement and just use Drylok with cement tints. A lot of people do it this way. Then you don't have the pH issues and the long cure time.
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Old 02-26-2014, 09:55 AM   #12
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If I were to do another background I would try the drylok just for change. I didn't mind cementing my work. I didn't have fish in my tank and wouldn't have the tank ready for fish for a couple of months as I am building a new stand. So the cement worked great for me. I had time to wait for the curing process.
I think you main issue is going to be mounting it to the back glass. If you don't use magnets you are going to have to drain the tank and wait 48 hrs for the caulking to cure before any water can go back in. Good luck. It's a great project to work on.
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Old 03-04-2014, 02:36 AM   #13
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Any other less..... Buoyant solutions? I love the look, but any ways I could achieve it not using styrofoam? I think I'm going to go with the cement shell idea, and just burn the styrofoam out after... But if someone has another solution I'm all ears!
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Old 03-04-2014, 09:41 AM   #14
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Well, you could use actual rocks. Be VERY careful when burning the styrofoam. That stuff releases so many toxic compounds when it burns. I'd wear a mask, do it outside, with a fan blowing.
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Old 03-04-2014, 10:53 AM   #15
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If you really want to get rid of the syrofoam spray acetone on it from a spray bottle. It will melt away. Make sure you leave some on the sides and top and bottom so you can attach it to the back and it won't allow your fish to get in behind it.
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Old 03-04-2014, 01:09 PM   #16
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Here's a few photos of one I did awhile back. I used pink Styrofoam and expanding can foam with Drylok and concrete tint.









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