I live in a house that was built in 1900. The previous owners painted over oil based paint with latex and the latex paint is peeling off in some places. Do we need to peel all the paint off, or just the places that are peeling before using Kiltz and then painting with latex paint?
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I suspect that you have to remove all the paint. I would consult the troubleshooting line of the paint company that you are planning to use. They can be very helpful.
If you just peel off the part that is loose, the walls will no longer be smooth and it will be very obvious after you paint. Unless almost all of it is able to be removed by peeling and perhaps light stripping. There is one more important consideration here: since it is an older house, there may be layers of lead paint under all of what is now there. In the past, people used oil paint to cover up a multitude of 'sins' from lead to mold to smoke damage. And in some cases older people still swear by it for kitchens and porches, because of its durability.
Never paint latex over oil! Go to the place where you bought the latex paint and tell them what happened. They will probably sell you some sparkling compound to repair the wall. Then buy another can of oil based paint (semi-gloss) and paint your wall.
A lot of people use oil based paint on doors because it's easier to wash off fingerprints. Painted walls fell out of vogue years ago.
Good Luck.
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