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This is a great thread! 42 is really expensive! 40 Is the same formula, but you can change the mix ratios and don't have the cost of the gun. I supposed you would brush it on the edge of the acylic and then join it. I don't know what that does for bubbles and oozing, but those are the two formulas they recommend for aqauriums. Is weld-on #4 really strond enough to hold a 1/2" 180 gallon sump?
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