I have just repainted them (albeit using the same paint) a few months ago…
the previous coat lasted a few years though.
my friend said it could be the paint is poor quality, or old.
I am thinking of buying new paint but want to seek help from here first.
I have never seen that effect before.
What is the wall made of? Gypsum board? plaster?
To my eye, it is clearly defective paint. Assuming there is nothing significantly different about the wall, that paint was clearly bad.
Assuming the wall is OK, you definitely need to use a stain-blocker before you repaint. KILZ is the go-to for this, but check with a paint store. There are some really cool products out there.
concrete wall
it lasted ok for several years… then these streaks turned up.
i still had some leftover paint from a few years ago so repainted.
then these streaks emerged after a few months gradually.
Does the white part feel powdery? It could be efflorescence.
thanks!
it’s not powdery… feels like a stain
Did you stir the paint ?
Seriously, that’s the first thing I thought of too.
You could always blow it off and call it modern art. That’s very weird.
I would show that pic to the paint store guy. Modern paints are great. Expensive, but great.
I did… afaik
Call the high priest; your house may have leprosy.
Lev. 14:33-57
I want to repaint tbh, and this time to buy new paint.
but i’m worried these stains will reemerge again
If it appeared after several years, then reappeared some months after a repaint, it seems a good sealer/stain-block is needed (as others have said).
Go to a real paint store (i.e. not Lowes or Home Depot) and get a professional opinion and good paint. A good stain blocker + good paint ought to fix it!
Prime first with Kilz. I’ve used the product for years and it provides an excellent barrier between old paint and new. Your walls may have been painted with oil paint and now you’re trying to coat with latex. They’re really not compatible.
Kilz would be my first thought to, but give the paint store guys a chance–there are multiple kinds of stain sealers, for different kinds of problems.
It would help if you mentioned the kind of paint you used, how you applied it and the environment of the room. Going by the pics, it could be frosting. One way to find out is to wash the streaks with a damp cloth. Does it disappear when wet then reappear when dry? If so, then it’s most likely frosting.
To fix it, you’ll need to apply a waterproofing primer or a resin-based primer before adding a new topcoat. The key is to prevent surface moisture contamination.
One of my favorite words.