Paint wont stick to wood (outdoor)

[JEDI]

I'm repainting my front steps. it was last painted 3yrs ago.
im beginning with the vertical sections first.

I'm using outdoor latex flat.
but the paint is peeling off the next day.
WHY?

and how to fix it?

 

[Pick2]

Sounds like it has a coating of oil or something on it. Maybe pressure wash and let it dry thoroughly.

 

[Greenman]

Did you clean and prime first? I've had pretty good luck with Gripper, they have it at home depot.

 

[disappoint]

I'm repainting my front steps. it was last painted 3yrs ago.
im beginning with the vertical sections first.

I'm using outdoor latex flat.
but the paint is peeling off the next day.
WHY?

and how to fix it?

Possibly because of incompatibility of modern latex and old oil based paints. If it had several layers of oil based paint previously then you have to stick to oil based paint or strip down to bare wood and repaint with latex. Source: https://www.thisoldhouse.com/ideas/why-my-paint-peeling

As co-author of "Finishes for Exterior Wood," a book summarizing the lab's 75 years of paint research, Knaebe knows a quality job takes time. He recommends starting with a quick test to determine the extent of the work. First, choose an inconspicuous place where the paint is worst. Clean the surface, let it dry and paint a small patch. The next day, press on a Band-Aid and then quickly pull it off. If the tape is clean, it's safe to repaint after scrubbing the whole house. If the tape pulls off all the paint down to bare wood, the house needs to be stripped before it's repainted. If just new paint comes off, the old paint is too chalky and you'll have to coat the whole house with an oil primer first.

For houses with some flaking but not enough to require stripping, remove loose paint with a scraper and a power washer, taking appropriate precautions if you suspect the old paint contains lead. Sand all bare wood and exposed paint edges or the new paint will be thin there and will chip in no time. Scrub the walls with water and kill any mildew by using a solution of one part household bleach to three parts water. Rinse and let the wood dry.

Most painters would simply prime and then paint at this point, but Knaebe recommends coating bare spots with a water-repellent preservative specifically labeled as compatible with paint. The repellent will limit shrinking and swelling of the siding due to moisture.

Three sunny days later, you can prime the bare spots or coat the whole house. (If you've stripped all the paint, latex primer is recommended.) Apply the finish coat soon. Soap-like compounds can form on oil primers in as little as two weeks. If there is a longer delay, scrub and rinse before applying the top coat. Two coats will probably be needed with latex, Knaebe says. Before painting, check the air temperature and the weather forecast and make sure they're compatible with the weather guidelines on the label. Weather that is too hot, too cold, too humid or too windy can undermine the best prep work.

 

[JEDI]

Did you clean and prime first? I've had pretty good luck with Gripper, they have it at home depot.

i scraped off loose old paint but no primer.
guess i'll use a primer.

Possibly because of incompatibility of modern latex and old oil based paints. If it had several layers of oil based paint previously then you have to stick to oil based paint or strip down to bare wood and repaint with latex. Source: https://www.thisoldhouse.com/ideas/why-my-paint-peeling

the old paint isn't oil based. I painted it myself when it was bare wood.
just stumped why the new paint peels the next day.

 

[disappoint]

Oh yeah you need to use primer. Also maybe sand it so the surface is rough and the primer and paint will stick better. Good luck!

 

[JEDI]

well

Oh yeah you need to use primer. Also maybe sand it so the surface is rough and the primer and paint will stick better. Good luck!

just used primer.

hm.. they sell primer and paint all in one?!
how's that??

also, I think the paint I used last time (3yrs ago) was acrylic latex.
could that be the reason why regular latex paint peeled off?
and how well will primer stick on that?

 

[disappoint]

well
just used primer.

hm.. they sell primer and paint all in one?!
how's that??

also, I think the paint I used last time (3yrs ago) was acrylic latex.
could that be the reason why regular latex paint peeled off?
and how well will primer stick on that?

There actually is no difference between latex and acrylic paints because there is no latex in latex paints. Let me explain. All water based paints today are referred to as "latex", even though there is absolutely no latex rubber in the formula. Latex has become a generic label. The stain, water resistance and covering capabilities are achieved by using acrylic resins or vinyl . Better quality paints have more acrylic resins than vinyl. Paints with a higher percentage of acrylic resin cost more. Vinyl is much cheaper than acrylic and is often used to mix with the acrylic to keep the cost of the paint lower. If you have special needs that may require a superior or better adapted product, the best advise is to go to a professional paint store and discuss your situation with someone that can explain the chemistry and applications of better products.

From: https://diy.stackexchange.com/quest...-between-latex-and-acrylic-water-dispersion-p

 

[Scarpozzi]

Preparation is key. Get a wire brush and score up the coat you're trying to paint over. It's a pain, but paint doesn't always like to stick to other paint, especially water and stain resistant varieties.

 

[mindless1]

I'd use oil based. Exterior wood likes oil based.

 

[shortylickens]

Something I learned painting while in the Navy: Primer is the real gem.
Its what actually protects your surface, and it sticks better as well.
Paint is really just for making things look nice, thats all. It doesnt do any real work.

 

[NetWareHead]

I'd use oil based. Exterior wood likes oil based.

This. I try to use oil as much as possible due to it being more durable. Yes it stinks like solvent during application but that concern is only applicable when painting indoors. You will need paint thinner or turpentine for cleanup but IMO a minor inconvenience when considering the better paint.

Something I learned painting while in the Navy: Primer is the real gem.
Its what actually protects your surface, and it sticks better as well.
Paint is really just for making things look nice, thats all. It doesnt do any real work.

This. Even if you get the mixed paint and primer in the same can, its better than no primer at all. I tend to sometimes do a priming step with standalone primer before painting if the situation calls for it.

 

[Meghan54]

Maybe give this stuff a shot.....have had very good luck with Zinsser products, moreso than Killz crap.

http://www.rustoleum.com/product-ca.../primer-sealers/bondz-maximum-adhesion-primer

 

[mindless1]

edit: can't reveal this, out of timeline.