Re: Possible explanation... (archive)

I've done two shops of my own......
The first was a disaster and I traced the failure to the acid etch process. It's very difficult to stop and if not done, causes a dusty condition that simply defeats the mechanical bond you're looking for from the epoxy.

The second time I used the Griotts product, and followed they're instructions. They ask for the acid etch as well but also add another step where they want you to neutralize it with Ammonia solution. I was really worried because of the previous mess but followed instructions to the letter. Then I pressure washed it. Then let it dry, and no dust. Then they have you re-wet the surface before applying the epoxy, they want it just barely damp.

AND it turned out perfect and have only one spot the size of a quarter, out of 1500 sq/ft that lifted so far. And I park HOT TIRES on it, and have spilled just about every chemical I use in my shop on it..... so far, so good !!!

Shawn -
This may have more to do with your concrete than the epoxy. When you pour concrete, you have to screed it right away, then wait a certain amount of time before trowelling. The surface of the concrete must be kept damp during this interval otherwise it will flake. This isn't likely your problem, as it's pretty noticeable. The time interval between screeding and trowelling is temperature dependent. If done too late, the concrete will not adhere to itself well. I'm probably not explaining myself well, sorry. Late-trowelled concrete is always dusty, because the surface is fragile rather than flaky. On a freshly washed floor, you can rub it with a piece of wood and create a little pile of grit.

If you still have a paint piece that pulled up, check the underside to see if it is covered with coarse concrete dust. If so, no paint or epoxy will work for you. Maybe your new home warranty will be of some use?

Good luck,
-dlw

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