Dave Ceddia @daveceddia.com · Dec 14 This hardened tile adhesive glue stuff (mastic?) comes off easy with a heat gun btw! ❌ sanding (no help) ❌ scraping (not great) ❌ water (did not soften) ✅ heat gun + scraping Wear a P100 though! Smells like burning plastic.
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Probably past this point already. But could you try a rotary hammer drill with a chisel attachment? More dust this way, but no smells. Hats off either way, looks like a lot of work
Also: keep a fire extinguisher and a spray bottle nearby. Apparently it can catch on fire.