I did it once on a chip that was located on the top of a rimless tank. It was better than nothing but not up to pro standards. The stuff is not real easy to work with but if it is on the back you won't see it anyway. As far as stopping any more cracks...who knows but it can't hurt for $10.
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John
100 gallon DT and 50 gallon sump with refugium. Reefbreeders Photon V2+.
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