Last week I worked on a concrete floor that was having a few minor paint adhesion problems.
Just kidding about the "minor" part... most of the paint on the floor was peeling off in big sheets.
It seems that there was a moisture problem in the room which has since cleared up. No one reported any flooding, and the water was already gone when I did my weekly inspection. I don't know the source of the moisture, but I suspect it came in under the entrance door as a result of drainage problems caused by the construction going on next door.
After scraping up all the loose paint, I primed the surface with "Peel Bond". I mentioned this stuff in a previous post about fixing a peeling concrete ceiling. It's made for problem areas where paint won't adhere. This foyer gets some foot traffic, so this should be an excellent test of Peel Bond's durability.
After letting the Peel Bond dry over night, I came back and top coated the floor the next morning. Cutting in and rolling out really takes the least amount of time. Most of the work was in the prep.
I'll be interested to see how the Peel Bond holds up to foot traffic. It's held up so far on the ceilings I used it on, so I'm very optimistic about it.