I applied diamond hard to my new 1800 sq ft. shop two weeks ago. The application process was not smooth, and I want to talk about what went wrong, so perhaps others can benefit. I still like the product, and if I had to do it over again, I'm not sure exactly what I would do differently, but certainly my expectations about the process, going in, were not met.
The stuff apparently creates an instant reaction with concrete, and I'm not sure why, but when they talk about don't step on untreated areas with wet shoes, they are right! In fact, squeegie marks, all kinds of things, will leave lasting areas of treated concrete that you cannot change, even when you come back with new Euco. Same with drops from the sprayer. Even if you are moving stuff with a squeegie and it splashes some product on a new area, you just got splash marks that aren't going away.
The instructions talk about wetting it down and pushing all the water to a new area to be treated -- I did this, but its part of why the process just doesn't go well...I think the watered down Euco isnt quite as strong as the original stuff. I did leave some areas that were a little thick, and they show now.
I think the basic problem was that I was working solo, and trying to treat one area at a time. So, I often had to stop and go back to the areas I had already treated, wet down, move water, etc. My opinion is that the whole thing would be much better done with a team, and doing it all at once...spray the entire surface, wet the entire surface, and then get it all off using squeegies and perhaps some mops.
Probably the bottom line is that the process just isn't that smooth (others on the forum mention problems too) and you will add imperfections to the floor...but, who cares? My floor already has all kind of imperfections from the troweling, and its destined to be a working garage and shop. Some of the problems I introduced -- a few footprints, some places it gelled up because I didnt get it off, well..no big deal.
I bought 10 gallons and only used about 6 on the first coat, perhaps due to the density of the concrete or my technique. Given that I had extra, I put down a second coat about a week later. For that, what I did was use a mop and simply lay down another coat on top. Now that I had experience, I knew to watch very closely for any areas where there were drops on the surface -- I went back on my hands with rags and dried off where I could...I'm sure I missed some areas but the mop left it pretty thin anyway.
The second coat *does* make a difference as to how it looks, left it a bit darker after the 2nd coat.
I'm hoping I can forget about the floor now, and it does clean up very well...also, water soaked a bit in after just one coat (mopped it clean) but after 2nd coat, water just stands on the surface and sits, even after hours. Not at all slippery. Epoxy was not an option, this still seems like a pretty good choice.
-Todzo