[jaes]

Approximately, 7 years ago, I had a 8' X 15' section of a 15' X 25' concrete basement floor jack hammered up to put in a drain and sump pump pit. So, the new concrete 8' X 15' section was poured about 7 years ago. After letting the new concrete section cure (about 6 months), I painted the entire basement floor with an oil based floor paint. In about 12 months, the paint on the new section of the basement floor ---started to peel off in spots. I scraped off the spots of peeling paint, and let the floor alone for approximately 6 months. After the 6 months, I REpainted the whole basement floor again. Approximately 18 months after the repaint, the 8' X 15' "new" section of concrete floor started to peel again. For the past 5 years, I just let the floor alone. ---In that time, the "new" section of floor has bleach out the "tile red" color of the paint (the "old" section of the basement floor, held the paint fine.) ---Well, I would like to give painting the whole basement floor another try. QUESTIONS: (1) Am I doing something wrong preparation wise? (2) I need specific brand name suggestions for painting over concrete (remember, the problem section was poured 7 years ago, it should be cured by now??). --Thanks for any help. ---Jaes.

 

[Gymschu]

A bit more info would be helpful. What brand of paint did you use? Was it Behr by chance? Also, it may not be the paint. It may be moisture wicking up through the patched area. Hopefully you put down a vapor barrier on the ground before pouring concrete into the patch. For stuff like this I use Sherwin-Williams latex porch and floor enamel. Scuff the floor with an orbital sander and 80 grit paper, remove any dust, and apply 2 coats.

 

[jlhaslip]

I agree with the moisture reply.

The only other thing that might fix it is to acid wash the new concrete, but if moisture is the issue, then it will not help.

Try taping a plastic bag or a piece of plastic to the floor and leaving it for about 4 weeks. If there is moisture in the slab, the spot under the bag will show as being damp/wet. Make sure the perimeter of the bag/plastic is well taped and continuous or the moisture will leak out.

 

[MoversRoswell]

We use typically that epoxy paint for basement floors or the garage based floors. It works great generally but that is if there is no moisture like the above folks mentioned. I don't like the regular floor based paint anyway, the epoxy based paint is much more durable and long lasting in my opinion and experience.

 

[Gettysburg]

I've had zero luck with acrylic latex floor paint on either wood or concrete. It just isn't that durable. We had a sump pump put in our basement floor and did NOT put a moisture barrier over the dirt before the new concrete was poured. We only had a 2'x2' area jackhammered up. We could not get paint to adhere either. How about a marine or swimming pool paint?

 

[mark sr]

If moisture gets under paint the paint will fail. Pool and marine paints protect from the top down - not from moisture that comes from below the paint.

 

[cocomonkeynuts]

This happened to one of my painters recently with the c112 alkyd floor enamel. 6 months after applying certain spots the paint is peeling, the paint did not fully cure in some spots.
You guys using the acrylic stuff: Concrete needs to have a good surface profile before you apply it. Ideally you want it feeling like 80grit sand paper and it will hold up just fine.

mark sr is correct, marine/swimming pool paint will not fix this issue. Same issue when paint peels from basement walls without a exterior moisture barrier. If you have a moisture issue it won't matter what coating you put down its not going to adhere.

Get a moisture meter!

 

[mark sr]

While not as accurate/quick as a moisture meter, taping a couple of square feet of plastic down for several days will give you a good idea of whether or not there is moisture migrating up thru the slab.