TX,
I put a porcelain in my workshop (nearly 1100 feet). It was on smooth standard concrete. I had to work up some oil spills before laying tile and I found the wet concrete slippery. When I finished tiling, I washed the grout haze off and found it only marginally more ice-like. I spent almost an hour working on it (age 59) and never fell down.
In the house garage that I am presently tiling, the floor was two-coat epoxy with no flakes or anti-skid. It was the slickest surface yet when hosing it down after buffing it to a "key" with 60 grit carborundum pads. I have been walking on the finished tile for three days, often through spilled water or areas I wiped for mortar haze. No problems yet.
The tile I selected had no "hydroplaning" rating. I bought a sample and took it home and verified the color would work. Then, I wet it and wiggled my foot around on it. Then finally, I threw sockets and other heavy things at it to see how easy it chipped. I ended up buying 1800 sq ft of the product.
My house is 100% tile inside. I occasionally help my wife with floor cleaning chores and I mop the floor. Yeah, you have to be a little careful on the tile until it dries but, it wears like iron. In my workshop, I'll probably mop once a year but a weedie blower gets 98% of it clean and nothing else really sticks to it.
I expect the normal amount of runoff from my vehicles as they come in from the rain but, the grout lines help contain most of that until it dries. I'd probably avoid "smooth polished" tiles in the garage but buy a standard tile with some surface grain and wet it to see how it works for you. Mine were 1x2. The more grout you have the less opportunity for slipping. (The tiles in my house are 16x16.)
Wish you lived closer by. You could come "skate" on mine.
Ray
