Went to horrible freight to buy four gallons of evaporust, and a couple of 5 gallon pails the other week.
Cleaned a big piece of chain in them and set them aside. Now, keep in mind I was very gentle lowering the chain into the pail. But wasn't too worried, I've got 5 gallon pails loaded full of logging chain that have held up to that for ever. I've seen buckets FULL of copper pipe fittings and nuts and bolts be manhandled for decades without issue. Even the big tumbler I made uses a 5 gallon pail. That was full of this chain and about 50 lbs of driveway gravel, rotating for about 6 hours without a problem.
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This horrible freight pail, however decided to spring a leak. Who knows when. And let a whole bunch of my brand new evaporust run into the floor drain. Needless to say, I wasn't happy. Unloaded my whole vocabulary of unkind words at that bucket.
I think what happened, is the molding process leaves a little teet at the bottom center of the bucket. That sticks down below anything else around it. With any weight in the bucket that point load will crack the pail. The stupid thing is, that chain soaked in that pail for 2 days. It was only after the chain was removed that it leaked.
The really stupid thing, this is a MADE in USA pail!