Just two weeks ago I saw some pool epoxy in action at the corporate campus of a Forbes Global Top 100 company in North Carolina.
They have a huge man constructed lake which is treated a bit like a natural lake, complete with fish, turtles, vegetation, bottom soil etc. And naturally along with all that comes algae. This is okay at the pond end of the pool, but at the other end they have a large fountain, not a natural waterfall type design, but a multi-level architectural abstract design.
The fountain is integral to the water feature, and the water cascading over the fountain is pumped directly from the lake, after only passing through a large debris filter. That means all the algae also flows through the fountain. The fountain has smooth finished sides and surfaces, finished surfaces not aesthetically compatible with algae.
In fact they were frustrated with all the algae and the damage it did to the fountain, so they coated most of the fountain sides with various water proof coatings. The problem was that the coatings either failed, or the algae would still adhere to the coatings.
The facility manager and the onsite maintenance contractor did a bit of research and fished around for solutions. Eventually they heard about Wolverine's BondTite 1101 and LiquaTile 1187 combo (not the LiquaTile 1184 designed for shop floors) and ordered a few barrels of both. They looked into having a coating contractor come on board to apply it, but eventually decided to DIY the job. (They certainly have a crew large enough to tackle the job.)
They shut down the fountain, removed the failing and loose pre-existing coatings, and put down the BondTite and LiquaTile. Because of the wildlife, landscaping, and deadlines, they didn't do as much prep work as we usually recommend. No grinding or shot blasting, and with all the fish, turtles, birds etc, obviously no acid or other harsh cleaners, strippers, or other chemicals.
I think the completed the entire job over a weekend or so - pretty amazing for such a huge DIY undertaking.
I was there just tagging along on a periodic check up and discussions about the use of some of our other coating for other projects - and the fountain coatings are performing beyond their expectations. Algae still accumulates on the coated surfaces, but wipes off with the swipe of a fingertip or rag.
LiquaTile 1187 is the same epoxy we spec for home pools. Now in that corporate fountain they run tons of water over the various water features every second, the main ledge was probably 70 feet wide, and the water is extremely algae laden, so of course some algae would build up, but in a typical home pool that's very unlikely to happen.
In fact that's one of the advantages of a good epoxy pool coating - it can be so smooth that the algae can't grab onto the sides, just no footholds for it. If it can't attach anywhere, it doesn't grow near as much, or even grow at all. So generally pool owners find that they can maintain the pool with using less chemicals - a lot less. That means filters last longer, plumbing lasts longer, deck and pool furniture aren't bleached as quickly, and lower maintenance costs all around.
Also the epoxy coating is a lot tougher than typical pool plaster or marcite, so that expensive pool wall rehab isn't popping up every 8 or so years. Some of the epoxy (well at least one I know of) remains a bit flexible after it cures, so there are far less cracks, which means less leaks, which not only reduces the water bill, but helps prevent further erosion of the surrounding earth basin etc.
So "Yes," there are pool epoxies, and I'll find out how suitable our 1187 would be on a floor, and that may help you determine whether or not to apply a pool epoxy on a garage floor.