I hear ya! Im about in the same boat. My car garage is 30 x 40. A couple of years ago I painted, put in wainscoting and crown moulding and heat. My wife still gets after me for the crown mldg! I stopped when it got to the floor for cost reasons. I too will diy when the time comes. Still not sure on what to use though. I have even considered just doing the bay where my TA parks.
If I were you I would still check into a grinding service. We did a rest. a few years ago with an acid wash, clear coat and subbed the grinding part. 3 guys came in and had it done in a day with the 'proper' equipment. Saved a bunch of time. For my time if it cost 5-600 it would still be worth it.
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