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Why not chip off the epoxy coating? Haven't tried it, but I'd imagine it would come up about like old thinset. Chip off most and then grind off the rest with a diamond cup wheel.
Afterwards, recoat with an epoxy paint or a skim coat of a cement product.
Anything would be cheaper than a new patio.
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Get yourself a rotary hammer. Set it to hammer mode, it will make the job much easier. I have a Harbor Freight one that has worked well for me for a few years.
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Standard epoxies do not take heat all that well. Some will suffer heat deflection at 120 degrees F, though there are some thermoset epoxies that are more heat resistant.
On a warm day with the sun baking on the surface try using a heat gun to soften the epoxy and scrape it off.
On the other hand some epoxies will cross link at 350 degrees and doing this might actually make the bond stronger. Try a small section first.
I have no personal experience with this I am reporting what I've read over the years.
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