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I used a long flexible adapter on a drill with a wire brush to knock scale off and then used an Eastwood spray can rust coat product that came with a long straw and a nozzle that sprayed sideways. I will see if I can find it on their site. I will need it again. I also used it on the inside of anything I could not otherwise reach - door pillars, inside the frame, etcI want to coat the inside of the doors with something....does 'mud have a good recommendation? I've been looking at the Eastwood products and they look good. I still have quite a bit of scale to work with on the inside of the doors that I'd like to neutralize.
Here is a trick that I learned from the YouTube. Instead of cutting out a patch panel and trying to butt weld, tack weld your patch right over the skin that needs to be replaced.
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Then start cutting right along the edge of the patch panel but cut at a 45 degree angle and only about 6” at a time.
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then as tacks release, slip the new panel down into the old metal a little at a time and re-tack it in flush with the original metal.
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work your way around taking your time and keeping it cool and you don’t need clamps or need to worry about poor cuts or warping the panels.