Here's an oldie with a twist. Use pieces of garden hose or other tubing to soften the jaws of slip-joint or other pliers so you can grip plated surfaces without damage. The twist? Size them so you can slide them up the handles to keep them handy.
Well worth using for bending angle iron or flat bending on making "flat corners" that are hard to control with out crimping. with setting a good spacing for various width could also be used from thin up to very heavy bar stock.