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Had a real mess with a 2020 F-150's aluminum bed side in the shop today
We were doing a repair on a dent near the wheel arch, and the weld-through primer we used reacted badly with the aluminum. It created this weird, bubbly residue that ruined the surface prep. Had to stop everything, strip it back down with 80 grit, and start over with a different brand of adhesive promoter. Anyone else run into compatibility issues with aluminum-specific products lately?
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the_paul7mo ago
Man, that sounds rough. It reminds me of a buddy who tried to patch a boat hull with the wrong epoxy and it just turned into a sticky mess. Seems like the specs on these new materials are getting really picky.
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perry.elliot7mo ago
My uncle's a marine mechanic in Tampa. He says the wrong mix ratio on modern two-part resins is the number one DIY failure he sees. They're not forgiving like the old stuff. You get a 5% margin for error, max, or the chemical cure never finishes. It stays that gummy, weak state forever. Basically turns a simple patch job into a complete redo of the whole section.
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olivia_harris196mo ago
Totally believe that. It makes me think of my neighbor who tried to fix a crack in his kayak. He was so sure he could eyeball the two-part mix, said he'd done it for years. Ended up with this permanent, tacky mess that collected every leaf and bug in the yard. Had to scrap the whole thing. It's like what @the_paul said, the specs are everything now and you just can't cheat it. That gummy failure is such a pain because it's not an obvious break, it just slowly falls apart.
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