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In that case get a grinder and do bits at a time.
I'd try and make some sort of rough level out of a long bit of scrap wood to make sure you don't miss any.
Idk if this would work at all, but I wonder if you got a floor sander and the lowest grit possible and take off the top layer and smaller imperfections before selfleveling and adding the final finish - paint, epoxy, etc.
hugo7
chrismanc
Thanks, there will never be a car in there, so no issues there.
I can't really build up from the current level more than a little bit, there would be a step up in floor level from exterior to interior. Suppose it could ramp down to the door , but likely stats getting tricky to do.
I wonder if there is any way to cut out some of the bigger bulges there currently, most of the variance in height is limited to some small bulging higher areas