Saw a guy at the St. Louis trade show use a wet sponge to fix a sand mold tear

Paul Stone · 2026-04-03T08:25:04.944205+00:00

He was working on a big gear pattern and the edge tore when he pulled it, so he just dampened a corner of his sponge and pressed it back into place... it held for the pour and came out clean. Has anyone else tried this trick on greensand or is it just for certain mixes?

jason_bailey296mo ago

Yeah, that trick works way better than it should. I once tried to fix a tear with just my fingers like an idiot and made it ten times worse. Ended up with a seam you could spot from across the shop. A little water is the difference between a quick save and having to start the whole mold over.

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wren3073mo ago

Idk, I used to think you'd ruin the sand with water but nah, this stuff works.

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loganprice6mo ago

Tbh I've done that with a spray bottle on smaller molds. Just a light mist can save a whole pattern sometimes.

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