Hey retom, I just went through what you did with the oil base / latex transition. My floor is in my commercial kitchen. About 7 years ago I used oil based Porch and Floor enamal pain for my unpainted concrete. It wasn't super smooth and I used muratic acid to open it up better. Then I thined the paint 1:1 with thinner and applied two coats. It absorbed in pretty good. Then the following year I just painted it with straight oil base. Two years later it looked bad - scratched and worn off in the high traffic area. Gave it a couple more coats. Looked great for a while, then started to scratch and wear again. I should have thinned it again to let it absorb into the concrete - but there were crackes and chips in the concrete that were very obvious with the thin coat. Full paint cover them ok.
Getting frusterated - I didn't want to paint every year, or use the two part epoxy. I had a half can of regular latex floor paint from another project. So last September I cleaned the worst area and put one coat of the latex down over it. Now the two colours didn't match, but the latex stuck great. Infact there was no wear or scuffing compared to the oil beside it.
Now about a month ago I decided we better get it all looking good - kitchen inspections comming up... We took a lot of tine on the prep. Over the course of a week we sanded it by hand - just to ruff off the glase three times. We didn't want to take it all off, but I wanted to make sure the new paint would bond well.We then washed it several times...and swepted and swiffered and anything else to get the dust off and made sure it was dry.
I then used a latex floor paint called Drylok - made by UGL. I was aprehensive, but it went on very well. We gave it two coats used and only about 1 3/4 cans. They were about $35 each. The room is 32' X 20'. I am very happy so far. It is not as slick as the oil paint was. It cleans up and washes well. Only time will tell how it holds up. But to answer your question, yes you can paint latex over oil. Just prep, prep and more prep. Good luck, Grant
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