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The key info you left out > doing this yourself or having done ?
The following info is for DIY .. prices for having it done can vary wildly .. you'd just have to shop around.
But if time and inclination permit, you can save a ton doing it yourself.

After 12yrs your floor is about as cured as it's gonna get, and a good etching should suffice. The process would typically involve 3 cycles of > etch/rinse, etch/rinse, etch/rinse.
See the product's directions for acid %s, etc.

I've used the following on my own basement, and have been satisfied with the cost/benefit result.
It's a 1200 SF space, with moderate foot traffic and occasional furniture rearranging.

After etching (i use UGL Drylok Etch) is finished and the floor is *thoroughly* dry:

Two coats of a product called Epoxy-Seal, mfg. by SealKrete .. ~5 gal @ $35/gal
Followed by two coats of Clear-Seal, same mfg .. ~4 gal @ $30/gal (the clear coat goes further)

It's been 7 yrs since mine was applied, and still looks great, imho.
The few times something heavy/sharp has been dropped and caused a ding, I do a light spot sanding and the touchup applies/blends seamlessly.
With occasional ding maintenance, I can't see needing a do-over here for at least another 3ish years, and even that would only be as above: light sanding/color/clear.

A big caveat is that I wouldn't use SealKrete for a garage/shop floor .. there you're looking at a major materials expense for industrial duty epoxy.
But for your likely purposes, and assuming no environmental conditions out of the ordinary, it should prove satisfactory.

So for ~700 SF DIY: etching supplies $20, color coat $100, clear coat $100, misc cleaning brushes etc $30 = ~ $250 DIY +/- 20%

But the best thing you can do, and what you should try before anything else (impo) is get yourself a quality dehumidifier.
You're gonna need one anyway, and the result may have you rethinking the entire painting idea.
Run a hose from it's drain fitting (usually on the back) to a floor drain so it can be left running w/o needing to dump the integral bucket all the time.

A small portable fan somewhere else in the basement, running on low just to keep the air moving, wouldn't hurt either.