We are looking at converting a window into a door and smaller window at Mom's place so she has a level entry into the house. Right now she has stairs going down from the garage and back up again to the front door. The room was added on to the house in the 60s and the drywall was primed and painted with oil based paint. After the door and smaller window is installed, there will probably need to be drywall fixing. Can we just drywall over the oil based paint layer or do we have to re-prime the wall with acrylic primer before drywalling? Anyone got any ideas or experience with this kind of renovation?
Sorry, I can't help with the drywall portion of your question, but I can offer this: You are more than likely dealing with lead based paint with it being that old. I would use respirators when cutting the drywall. Real respirators....not dust masks. More than likely you will have to prime the whole room with an oil primer just to get latex paint to stick to the old oil.
Latex should stick to oil, we use oik based primer and latex paint over it all the time. If you want your paint to go on uniformly then you need to prime any plaster or drywall that is exposed.
the latex won't stick to the old paint. it needs primed with oil based primer then a topcoat of latex. I'm a contractor, I like zinser cover stain primer best. the oil painting isn't terrible.smelling anymore noeither with the low VOC formulas.
I think Woodwidow is trying to find out how the mud/joint compound will stick to the oil based paint. I think it should be okay, but I'm not a professional and seriously have no clue how to tell what the base of old paint is anyway, so could be incorrect. I've never had an issue getting mud to stick to anything.
It wouldn't hurt to prep the oil based paint with a primer before blending your mud over it. Keep in mind, drywall mud is water based.....
The reason i,say this is that several years back, my brother bought the house across the road and remodeled it. He had a buddy of ours come in and swirl the ceilings in the bedrooms (using water-based drywall mud), right over the old paint...... Turns out that old paint was oil based, and all the swirling peeled off in sheets.....it never bonded to the paint. So he had to scrape them off, primer them, and re-swirl them.....it was a pain!!
Scott is right... easy way to remember is water and oil don't mix.. everyone know that.. do not use a water base product on top of oil it won't work.. some primers are water based
Technically we could sand the old oil to get bonding, but that very well may get lbp particles airborne. That's a no go in my book. Prime it first with oil bonding primer, repair walls, reprime your new mud and wallboard, then paint in latex.
If it was a 60's addition it is highly unlikely to be LBP but to be safe buy a test kit. The dust settling out is far more dangerous then the little you will breath in. The dust that settles is how kids get elevated blood levels, adults rarely get it because of body mass. Cover everything and clean up with a damp cloth, only use a HEPA filtered vacuum, the dust will pass right thru a regular filter like a standard shop vac.
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Thanks for all the info. From what I have read and people have mentioned in this thread, I think my plan of attack will be scrub everything down with TSP, prime with Zinser cover stain primer (we can actually get this up here) and then mud and paint over it. I don't have to deal with a shiny surface to start with as it was flat paint. I will let you know how it all turns out. I have ceiling tile to paint as well. The soft acoustic type tile from the 60s. From my reading, the primer will cover the stains and let me paint with acrylic paint afterward.
That is what my ceilings are (what were they thinking in this climate?). Anyway, let me know how that goes and include pics if you can. I was thinking of ripping out the ceilings and installing sheetrock, but if primer then paint will "seal" it that would work better for me as I could do that myself (I'd have to hire someone to install sheetrock).
