For the best results in a repair I suggest letting a professional handle the work. Before doing this though, you should look into the reason that it is cracking. If this is from something like the slab settling, more cracks may appear in your new repair/topcoat. Have a few different professionals give a personal look at it and give their recommendations.
You can fill te cracks with concrete filler available at home stores. There's a product call, "LevelQuick" sold at Home Depot that will allow you to level the floor. It is an flexible, polymer resin cement repair and leveling/grading compound. See the attached brochure, http://www.alldeck.com/LevelQuickBrochure.pd...
I'm with Dan on this one.... We are local Atlanta area pros specializing in these issues. "Mega cracks?". Without layin an eyeball on it, your noting there is much more than normal cracking going on lends us to ask, "why?". We've seen garage floors which when removed show a cavity deep enough to swallow a small car. More than one lousy homebuilder buried yard debris under a garage floor, which when it decayed, caused "mega cracks" and worse.... Nothing like laying down a band aid only
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to find your car 3 feet under the garage in a few months....!
Wally, plz tell me your kidding... You have not personally been involved in this solution, have you? I know we have not seen the floor, but "grout it in to floor level and paint"? Seriously?
not grout ,,,an aggregate slurry,,,dont just post stuff ,,,,,,to,read your own writing,,i wouldnt post if it didnt work,,,,dont overthink it,,keep it simple,,,
I would suggest filling the void through a deep soil SlabJacking process which would pump a soil cement slurry into the area and stop the reason why it cracked to begin with, then resurface. Simple fact is that this process works and has been an application for these kinds of problems since the early 1930's.
this bears repeating - NEVER expect to find suitable materials for ANY technical project at the apron/vest stores - never EVER !!!!!!!!! i wouldn't expect a carpenter be knowledgeable on conc repairs NOR would i anticipate the reverse, either,,, 1st resolve the cracking issue - either by sub-slab sealing, mud-jacking, OR polyurethane foam injection - THEN address the appearance - i expect you will need full-depth diamond sawing to separate the garage floor into suitable dimensions as
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delineated by ACI - the world's acknowledged final word on concrete ! how does all happen while i'm vacationing ??????????????????
For the best results in a repair I suggest letting a professional handle the work. Before doing this though, you should look into the reason that it is cracking. If this is from something like the slab settling, more cracks may appear in your new repair/topcoat. Have a few different professionals give a personal look at it and give their recommendations.