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Latex paint over oil base paint?
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Posted by heypearly (My Page) on Thu, May 3, 07 at 9:13
| I admit to being an "old timer" so my gut says you can't put water based paint over oil. Every paint store I've gone to for advice as to "HOW?" just gets me a different answer.
The oil paint is on all the trim in my 200+years old house. NY state is tough on VOC's and it's nearly impossible to buy oil paint any way.
Anyone able to advise me about how to proceed? Would a primer like BIN be enough to block the 10 year old oil paint? THANKS! |
Follow-Up Postings:
RE: Latex paint over oil base paint?
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| The two don't mix either way... oil over latex or vice versa. You have to prime it first. I didn't and I put oil over latex on my concrete porch that was painted pink... let's just say it's now gray and pink speckled. =D I don't think the age of the old paint is anything to worry about... just make sure you scrape up any that is chipping and get a good primer. |
RE: Latex paint over oil base paint?
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| A light sanding and any good bonding primer will do the trick,there are many out there,Ben Moore Fresh Start is a good one,but all paint stores sell them. |
RE: Latex paint over oil base paint?
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Latex goes over oil just fine.
The problem is in getting good surface adhesion sine oil (especially older stuff) is often very smooth.
Light sanding or washing with TSP (the real stuff, not the substitute) will provide a good surface for a bonding type latex primer. Oil over latex is often a problem.
Latex paint is more flexible than oil paint, and putting a hard film over a softer film can often cause cracking problems. At the very least the hard film properties of the oil paint are compromised.
You can make it stick, but if you already have latex it is better to stick with latex. Some of the newer acrylic paints work as well as oil (alkyd) used to, and even have full gloss formulations now.
They often need a little Floetrol to level out nicely though. |
RE: Latex paint over oil base paint?
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| I get a kick out of all the different answers this question produces. Almost every answer on every website is different. Some say that you can't use oil paint over latex but the opposite is OK. Others say that you can't use latex over oil but he opposite is OK. Yet other say that they aren't compatible and neither are OK and yet others say that both combinations are fine. :-) My own experience tells me that oil based paints over latex work fine as long as the old paint surface is clean but that latex doesn't work well when painted directly over oil-based paints. (This is just the opposite of the advice given by another person here.) But I suspect that, with proper surface preparation and the use of the CORRECT primer, either paint can be used over the other. I would be particularly careful with preparation and priming when using water-based paints over oil paints. Whenever I have seen severe peeling and bubbling from the use of a combination of paints, it has been latex over oil. As oil-based paints get restricted and are less available, it will be more difficult to find oil paints in the future. TSP is an outstanding product for cleaning surfaces before painting. It removes all oil, etc., and it even etches the surface if it is mixed strong enough. |
RE: Latex paint over oil base paint?
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Hi,
I am a N.Y painting contractor. Now days a lot of waterbourne paints are equal to or better than oils. We usually use 100% acrylics. Acrylics are waterbourne, retain color better, have better elasticity, mildew resistant and other great charecteristics. You can use waterbourne over oil, but you should never use oil over waterbourne. First clean your substrate well, using tsp and a pressure washer, then sand and scrape as needed,caulk, prime with a 100% acrylic, then top coat. Most of the time we use Sherwin Williams products, we warranty all of our work, but will only do so when using Sherwin Williams products, they have a great line of acrylic primers and acrylic paint for your top coat. Visit us on the web www.kelloggspainting.com to learn more about acrylics. -Kellogg's House Painting N.Y |
Here is a link that might be useful: interior-exterior house painting contractor ny
RE: Latex paint over oil base paint?
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prime with a 100% acrylic,
Just be sure it is a bonding primer made for glossy surfaces, not all 100% acrlic primers are labeled this way. |
RE: Latex paint over oil base paint?
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We are using SW Duration Exterior paint on our 1920s home. Three fancy porch columns where I scraped, I didn't get all the old oil based paint off(dh won't let me scrape anymore which is fine with me lol.) SW Duration doesn't require a primer even on bare wood. We've been painting the house trim (four porches!) for a number of years now and the single coat over oil based that I did 4 years ago on those columns is still in fine condition. I'm sure there are also places where dh didn't get every speck of the old oil based paint off and everything that we have done is good. The single coat done last year on new wood where we are repairing our porches is beautiful. (20 below zero winter and hot summer and lots of crazy variation in temps this year). The wood that comes primed looks fine too, but the paint actually didn't go on as easily.
The house has aluminum siding and dh is repairing trim with and an epoxy in many places, and the paint over both these substances looks very good too.
I love this paint. It is a pleasure to paint with. It is very expensive however. We bought 5 gal buckets when it went on sale.
good luck! Post a pic when you are done! I will too but it will be in 2012, I estimate.
kathy
ps there is only one coat on those 3 columns because dh wants to go back and fix them when everything else is done (that is scrape them again to get the patches of old paint that I didn't get.)
pss carefully collecting the paint chips on drop cloths is a bummer, but you just know when its that old its got lead in it - so wear a mask when scraping too! |
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