Hi Jimmy
That "glass" like concrete finish has to be done from new. It`s called a power floated finish. They use a bit of kit that looks like a propellar ina cage that floats the surface off to a sheen before it hardens fully.
As far as im aware, youll have to just use industrial floor paint to get it smooth. Take professional advice before you use the wrong paint though and it all flakes off. you will probably need to seal it first. You can get self levelling screed thats normally used before you lay vinyl flooring or such like but i dont know if you can get any thats good enough for a car to run on.
Rich
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