There are sealer additives that shouldn't create excessive future maintenance.
http://www.hcconcrete.com/products/s...tant_Additive/
Appears to be glass bead media mix in a sealer.
That said - After 36 years in the flooring business the last thing I'd want is a finished floor in my garage/shop. When I built my place we treated the slab with a penetrating sealer and called it good. In key work areas I use pieces (remnants) of fiberglass stabilized loose-lay vinyl flooring for easy cleanup and comfort. 10 years later it has stains here and there but in my opinion it looks much better than any epoxy coating or hi-build clear sealer would after the same use and maintenance (lack of).
I use my garage as a work shop not a showroom and don't want to slow progress taking preventative measures to protect a floor finish.