I have tried painting garage floors myself in the past. Both times I used different products. Once was with Griots and once with a store bought "garage floor paint". I acid etched both floors with muratic acid and cleaned as best as possible. Anyone who knows me knows how thorough I am.
Both floors failed. One lasted 6 months and one lasted a year.
I have since hired it done professionally and it has lasted 5-6 years so far. I just recently hired another contractor to do sand off my old DIY floor and repaint.
Pro is the only way to go to make it last a long time.
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