Working Sheet Metal
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This can be a sheet metal general thread, but I have a question.
What is the easiest and/or best ways to seal up holes (1/4" to 3"x4") in sheet metal where they will encounter medium temperatures (500F-1000F)? The application is for a trash burning, double-walled, insulated cook stove. So, it would be preferable that the inner fire box be mostly air tight except for the air intake.
I have JB Weld (good up to 600F intermittently), a rivet gun, a few DIY spot welders, a DC battery-powered stick welder. The sheet metal I'm working with is from old salvaged appliances (microwaves/ovens/etc), so I don't know the exact thickness. I do not currently have any other type of welders, but have enough to make a MIG welder in the future.
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/diy/, I'm sick and tired of epoxy not drying for me.
I have almost never been able to get a batch of two-part epoxy to dry properly. It always just stays soft, no matter how careful I am to mix equal parts of resin and hardener.
The only thing I've ever been able to get right is Marine-Tex, but that won't work for what I'm doing now, because I need it to be clear.
I'm trying to waterproof something, but no matter how long I leave it to dry, I come back to it and the epoxy's soft, and water gets in.
What could I possibly be doing wrong? I don't understand. I highly doubt that epoxy is supposed to dry soft.