generally speaking, decent size double garage floor resurfacing runs about $ 2.00 sf in atl & 2 guys are done in less than a day,,, only 300sf ? make it $ 2.50-$ 2.75sf - in & out,,, its rare the good stuff is avail to diy'ers @ the apron/vest stores &, usually, diy'ers won't look beyond them,,, that just diy'ers - if the apron/vest stores don't sell it,,,,,,,,,,,,,,,,,,,,,,,,,, you can finish the rest