paint peeled off in sections (painting, cleaner, bathrooms, cleaning)

[bande1102]

One of my bathrooms started out a pepto bismal color. It was painted in the 80s so no idea what type of paint was used. I primed it and painted using lates. Part of the paint peeled off of the wall, in a large piece right back down to that ugly, original, pink color.

Does anyone know why the paint didn't stick in this area? I'm wondering if I just didn't let it cure long enough before people started using the bathroom? The rest of the room is fine.

[El Chingaso]

There could be tons of different reasons.

What kind of paint was on the walls previously?
What kind of primer was used?

[turf3]

Inadequate surface prep.

First thing you must do, is make sure the substrate is very very clean. There are a variety of ways to do this. Go to a paint store (NOT Home Despot or Lowe's, but an actual paint store) and get advice.

Unfortunately you'll probably need to try to scrape the stuff on there off - if much of it has peeled then you can expect more to do so. Anything you put on top of it's going to do the same.

[Parnassia]

Originally Posted by El Chingaso

There could be tons of different reasons.

What kind of paint was on the walls previously?
What kind of primer was used?

OP said that is unknown.

[southwest88]

Originally Posted by El Chingaso

There could be tons of different reasons.

What kind of paint was on the walls previously?
What kind of primer was used?

Yah. Scrape off a segment of the original pink paint & take it along. & the label off the primer, or the whole can, if that's more convenient.

Take both to a good paint store, & they can tell you what you need to do.

[pikabike]

The pink surface probably had oils (fingerprints) and other contamination that didn’t allow the primer to stick to it.

[silibran]

I'm thinking the pink walls were painted with oil paint. I guess scrape off some of the pink and take it to your paint retailer and ask for advice. You can't paint latex over oil without proper prep.

[Rickcin]

A bathroom that has not been painted in years probably has a some reside and a film on the walls from years of moisture, humidity and it could be semigloss which would make adhesion a little more difficult.

I would lightly sand the walls and use a good latex primer paint to bond and help cover the existing color.

[gemstone1]

Tri Sodium Phosphate, otherwise known as TSP used to wash the walls, once the latest coat of latex is removed will probably clean/etch the old paint enough to allow a new coat of paint to adhere. Is there an abnormal amount of steam/moisture trapped in the room during bathing ? Is there adequate ventilation ?

I have the same situation, excess moisture, no exhaust fan and a previous owner painting latex over oil, probably with no surface prep....(the same guy who placed a new metal roof, with no flashing) it's on my honey do list, but I'm not keen on placing the exhaust vent on the outside wall, my only option.

Regards
Gemstone1

[Rickcin]

Originally Posted by gemstone1

Tri Sodium Phosphate, otherwise known as TSP used to wash the walls, once the latest coat of latex is removed will probably clean/etch the old paint enough to allow a new coat of paint to adhere. Is there an abnormal amount of steam/moisture trapped in the room during bathing ? Is there adequate ventilation ?

I have the same situation, excess moisture, no exhaust fan and a previous owner painting latex over oil, probably with no surface prep....(the same guy who placed a new metal roof, with no flashing) it's on my honey do list, but I'm not keen on placing the exhaust vent on the outside wall, my only option.

Regards
Gemstone1

That’s how it works, oil has a great sealed and washable surface, that being the case it should always be treated or roughed up prior to receiving a new coat of paint❗️