I use the Hydrozo clear 40 in warehouses, sidewalks, indoor, outdoor, masonry, etc. Here in Oregon it is the approved Oregon Department of Transportation (ODOT) sealer for roadways.
I've applied it in walk-in coolers. Then had a forklift loading beer back in there in 45min. Can be applied to 20degrees F. It penetrates the concrete, solvent based, smells a little bit but not too bad, easy to use, breathable, easy to clean.