no big deal - we do that all the time when removing tile, thinset, linoleum, fake/real wood, carpet - anything,,, just a normal part of the work,,, we use chipping guns, scarifiers, & grinders to remove then polymer-modified mtls to bring the surface back - our mtl of choice is eliteCrete but there are other brands avail,,, NONE of its avail from the apron stores, tho - NOTHING !
gypsum-bas'd mtls aren't satisfactory nor would we pick anything self-leveling or mapei brand - however, you don't mention what final covering you want,,, that would impact your choice, of course !
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