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Applying Latex Paint Over Oil Paint

We just made a huge mistake. We painted latex over oil paint and now the paint is peeling. The advice that has been given is varied and we're not sure what advice to follow. Some have told us to scrape and sand as much of the latex off as possible before repainting with a latex primer.

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Others have suggested directly applying a coat of Zinsser 123 and then painting over with latex. Obviously we would prefer going the Zinsser 123 route since it would eliminate scraping and sanding. But I'm afraid that this may still result in peeling paint in the future. Any advice out there?

Popov from BC

Answers:

Applying Latex Paint Over Oil Paint

I have painted my house with oil based paint from Sherman Williams.They no longer make oil based paint that I used on my house, it is all latex based. So I have been using that to repaint my house with no problem at all. My suggestion is to explain your problem with the store you bought the paint from or contacting the paint manufacturer. (02/02/2008)

By Dean

Applying Latex Paint Over Oil Paint

I am a professional plaster and paint expert. I recommend you do the physical work and sand off everything that is capable of coming off. If you can find one, use an old Green Black and Decker sander. They are fast and plaster does not bother these old sanders. Then, I recommend you use ordinary plaster mixed with ordinary white latex paint and apply a coat smoothly over the rough spots on your wall. Use a large trowel and after the plaster is dry on the wall, sand, sand, and sand again until smooth to the touch.

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The next step is to use a "sealer" or "primer" and paint the wall completely. If you want perfection, sand again and apply more of the plaster/latex mix over any small imperfect spots you discover. One more time, use the sealer but this time, not over the whole wall, but simply over the small plastered spots.
Now you are ready for two coats of color paint. Use a professional medium fibre roller and avoid drips. Good luck. (02/03/2008)

By Joseph Raglione

Applying Latex Paint Over Oil Paint

Do not use latex primer. You can use oil base primer and paint over it with latex or oil based paint. Latex primer does not stick to certain surfaces no matter what they say where you get it. I know from experience. I paint houses for a living. The best thing to do is rough it up with a palm sander of some sort, not a rough grit, but just something that will knock off what is loose and get rid of it.

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It will take longer, but it is worth the trouble, otherwise you will have to do it again. Then I would suggest using oil based primer or Kilz to prime the wall or whatever you are painting. Then you can use either oil base or latex paint to add color.

Oil based paint will not adhere to latex paint, as latex won't to oil based. Just like water and oil won't mix. To the person that said they were planning on painting window seals and baseboards with latex, please don't. It will be a heap of trouble. If you use latex paint, it will come off easier and won't seep into the wood. It also chips away easier in high traffic areas. Cabinets, trim, and seals need oil based paint. Latex paint in mainly for walls. Furniture also needs oil base if at all possible.

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Hope this helps. (02/05/2008)

Applying Latex Paint Over Oil Paint

This is crazy. Latex paint was developed for going over old linseed oil paint. Latex paint needs a sanded, clean, and dry surface to bond to old linseed oil surfaces which you probably didn't have. Alaid oil is the modern version, which was developed to go over latex. The surface you had was probably moist. I know this because 90% of all paint problems are due to this. The rest is not sanding glossy surfaces.

I've been painting for 17 years. If it is truly peeling, you will need: 60 grit, 80 grit, then 120 hook and loop 5 hole sanding disks with a good orbital sander "Porter Cabel", a shop vac with dust attachment, and Hepa filter on your face to prevent lead poisoning of course.

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This will cost several thousand dollars to hire it out so get a painter's manual. Like the "Painters Hand Book", this will teach you the right way. Don't rely on the internet for any advice, all these ideas are stupid and dangerous enough to land you in the hospital. Believe me I've been there. Good luck. (10/28/2008)

By Steve

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