![]() you also apply waterproofing material to the entire underside of the crack along its length, and doing so on the top of the crack would be good as well. You then take the hole you have drilled, and fill it with epoxy or whatever waterproof material that you wish. Again - you do NOT stop drill where the crack has run out of material.ħ. ![]() If you have more than one crack end (crack has forked) - do this also at that crack end. You now take a 1/4" MINIMUM drill bit (3/8 would be better) and DRILL a HOLE at the END of the crack. But with some BRIGHT light, and a good eye, you can generally see (determine) the very, very, very END of a crack, even without a 10X. It is preferred to use a 10x magnifying glass. Stop drill is where we throughly examine a crack and determine its end. Where the crack exists in bowl material and the crack can continue growing - to stop it - you MUST stop drill it. Good luck! This is for a cracked ceramic sink. This isn't an exact fir for your issue but it sounds like a good place to start and is probably where I would start.
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