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I did my garage about 4 months after it was completed.
The "special primer/sealant" supplied was just PVA. Ho hum. However the 2k paint was lovely. Until it started liftying in patches, and I am certain the floor just wasn't dry enough. I am on chalk, near the top of a hill, and used a DPM. But i suspect the concrete floor needed longer.
The vast majority is still intact, and seems as good as when applied. I expect most 2k floor paints are very good. Just be aware of the issues I had if a new floor.
FWIW when I manage to empty my garage, I will be recoating the damaged areas. Very tempted to use a conventional floor paint, and screwfix "no nonsense" stuff has had great reviews elsewhere. But I worry about how long that will take to thoroughly dry and be "tyre proof"
In my experience "normal" non 2k floor paint is never "tyre proof" I first painted my floor about 15 years ago. It had a second coat about 10 years ago and has been "patched" several times where tyres have lifted the paint - the patches were thoroughly degreased, sealed etc. but still if a car is parked there for a few weeks - especially in hotter summer weather, it pulls the paint up - it sticks better to the tyres, years later, than it does to the floor. Must admit some cars/tyres seem worse than others.
I am considering investing in totally redoing the lot in epoxy paint, but it will be expensive and I have to sneak that past "the management"