[Traveller]

Robert is correct in stating that if you garage floor was pored without a vapor barrier underneath you will most likely have hydrostatic water seepage up through the slab.

If you're contractor did not spend $20 on a sheet of visqueen, you had a pretty ****ty contractor and most likely have other issues with your home.

One way to find out is to take a piece of 1' x 1' clear plastic (Saran Wrap) and tape the edges to the floor so that it's air tight and leave it for a day or too.

If you see moisture condensing under the plastic you're garage would not be a good candidate for epoxy.

Epoxy floor coating are not inherently fragile. My plant uses epoxy throughout its manufacturing and warehouse areas and I have had years of experience applying and maintaining them.

We also use the “slurry” material Robert mentions as well. Ours is called "Stonehard". It's very expensive and not for most residential applications.