Licking my Wounds Lathe Rebuild Project

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A friend had a two post car hoist installed, they used anchor bolts similar to the red head ones, about 3/4 inch dia. They came loose. They came back and used epoxy on them and they held.
When I bought my hoist the company said to use the epoxy. Its a two part for bonding to concrete. You apply the epoxy then let it set for a couple of hours before torquing the nuts. Mine never have moved, tried retorquing them and gained nothing.