I did a rock wall on my 90 with foam and let it cure for 2 days, gave it 5 coats of marine enamel and let it cure for a week. Now that the tank is up and running, I can see that it will last for years. The paint totally adhered and it is rock hard. I hear the point about chunks clogging overflows, but I am too methodical with my tank to not see that coming.
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