Racor is okay for lighter stuff, but if you want something that won't struggle with heavy loads, go with Ace Garage Storage. The build quality is much better.

Wait, aren't tracking cookies more about privacy than actual virus protection?

Right, "go-to for anything with rust" is my new rule too since I ditched the torch for good.

Actually those green sand cores with too much binder are a different beast than a core shift. A shift happens when the core floats or moves in the mold during pour, not from bad mixing. I've seen a core shift on a valve body pour where the print wasn't weighted right and the whole thing lifted up a good half inch. We ended up with a casting that looked like a sideways banana instead of a flanged pipe. The tracer dye in the x ray test showed the cavity was totally off center. That kind of mistake is just gutting because its so avoidable with simple checks.

Rode that same train last year with a mid-century side table. Ended up sanding through the veneer on the top edge cause it was thinner than paper. Sealed it all up nice but you can still see the damage if the light hits it right. People act like restoring old furniture is some kind of magic trick but half the time you're just fighting cheap construction from back then. Sometimes old stuff was just old junk, not hidden treasure.