I looked into that a few months ago while waiting for the concrete guy to pour the final section of the slab. Good sealers are expensive (at least $1k even for just 30x40) and need floor prep too. Cheap ones peel, lift and discolor and need to be removed, then reprep, then do it over.

Foot traffic will be minimal - just me when I'm working on one of my cars. I don't care if there are some oil-colored patches on the concrete wink

Besides, all my stuff is in the shop now and I really don't feel like moving everything from one side to the other (again)!

Finally, there is always dust coming in around and under the sliding barn doors, which face east and west, matching the prevailing winds. I'll never get it hermetically sealed... So I will just blow the dust away with compressed air, a push broom or a shop vac. I already learned that I can't paint worth a crap, so dust isn't a consideration there.

I am ready to start USING the lift and smooth dry floor up