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Most epoxy floor kits come with muriatic acid to etch the untreated concrete to aid in adhesion of the of the primer/epoxy. The professionals use a concrete grinder which you can rent to create the required "rough" surface. This will be better than the muriatic acid. You will be able to see the spots you missed. If you go with the acid route, I would recommend you do it multiple times to ensure better results.
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