It's all about the prep. Do that well and the job turns out great. Do it poor and you have issues. I have had or have done four garage floors. My VA home was the biggest challenge. 35 years of cracks, grease, stains etc. Rust-O-ileum also makes a product for patching cracks. A two part epoxy mix that fills the cracks. I had one really bad crack that I had to take a sledge hammer and break out all the loose concrete. Crack ended up at 3 inchs wide by 6 feet long and about an inch deep. First used concrete patch to fill it within a 1/4 inch, then used the epoxy and rented a floor sander from Home Depot and it looks like a new floor.
I highly recommend this treatment. Floor looks new and is so easy to clean with a hose and broom after completion.
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