![]() ![]() Q.2 - how large of a hole can I get away just filling in, before needing a reinforcing patch? Half-inch? There are two spots that are just pinholes right now, but they're directly overhead (the sliding shutter tracks have foam insulation that's above these points), but once I sand them down I expect to have to patch a larger area. I figure that I'll need a fiberglass or polycarbonate patch to reinforce the inside of the larger holes (well, definitely the couple of 3-inch totally-rusted joints that might just need to get chopped out). Weirdly, I emailed 3M and they stated Bondo "is cosmetic only, not an adhesive" and that they "do not manufacture/market a product to meet your needs". Permatex makes a 25909 "Liquid Metal Filler", which claims excellent adhesion to galvanized.ģM Bondo Gold also claims adhesion to galvanized. This is in Hawaii, where there's equal part bright sunlight (read: intense UV) and rain exposure, salt breeze (one mile from ocean), and no chance of freezing. so, products need to be OK with high humidity and possible rain (though I can cover with a tarp) while curing/drying. we need to rent a crane), so I'll have to do this in-situ. The dome is incredibly difficult to disassemble (i.e. My thought is to repair by sanding/grinding away the rust, applying some sort of metal filler putty, and then painting over with a galvanized-approved paint. ![]() So, I think this is gonna be a "DIY" job. I also never heard back after asking Facilities if anyone on staff had repaired galvanized metal before. I'm not a welder nor do I expect the community college has funds to hire one for this job, though I understand that would be the most ideal fix. The panels themselves are, according to documentation, Galvalume the rest of the structure, g-90-grade galvanized steel. I'm trying to patch up holes rusted through a telescope observatory's dome. So far, I've only seen other questions around here about galvanized pipe or duct, so here's a new one for you all! ![]()
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