I have a little experimental box that I built out of sheet metal from my bus. I cut holes in the bottom, attempt to patch them in whatever way I'm experimenting with, then fill the box with water to see if the patches hold (the first thing I tested is using cork as a gasket material underneath patches, and I'm glad I tested first because it's like cork accelerates the water through it).
This afternoon I tried covering 3/8" holes with Dynatron-500, one with just that stuff and one where I added a tiny flat wad of steel wool to the dynatron on the theory that it would work kind of like fiberglass. They're both watertight, although the one without the steel wool is pretty floppy and seems like it could poke out pretty easy. The steel-wool-reinforced dynatron seems like it isn't going anywhere.
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