Oil base exterior - Contractor Talk - Professional Construction and Remodeling Forum

D.C.Pro · 07-29-2006, 06:28 PM

I have a large exterior wood frame house to paint,looks like it has not been painted in 20 yrs.It has on it now oil-based paint that is just hanging,ready to fall off.My question is,should I use 1-2-3 latex primer,then come back with Duration or just use 2 coats of Duration,the first being the primer coat.Dont know how well duration sticks to oil base paint.The color is white.Thanks

AAPaint · 07-29-2006, 07:28 PM

Honestly, I would use an oil or alkyd primer first, and then the Duration top coats. I know they say self priming, but if you want it rock solid, I would suggest an oil primer, then the Duration....especially for something that is failing badly already. Make sure you feather sand the edges of the peeling paint to a sound surface because no product you use is going to bridge the edges of cracked paint for long.

Richard · 08-02-2006, 07:34 AM

yeah...what he said, exactly....god I'm happy to see you're using SHERWIN!

KellyPainting · 08-02-2006, 02:07 PM

I'll 3rd that... oil primer...then 2 top coats

D.C.Pro · 08-02-2006, 03:58 PM

Guys,I originally had thought the same thing,in fact it is what i had always done in the past,but the last house I did that was similiar, the oil base primer formed an impermeable film that became brittle and cracked and broke into large chips.I thought maybe the 123 bullseye latex primer would breathe and flex and not cause a rapid peeling problem.Just my opinion.Thanks Doug

painterofeveryt · 08-02-2006, 04:05 PM

some say thats the problem with the oil based primers, they do not let the water vapor escape from the inside to the outside,therefore causing the primer (and topcoat to get) "pushed off "from the inside out.....just passing on what I have heard.

AAPaint · 08-03-2006, 01:05 PM

Quote:

Originally Posted by D.C.Pro

Guys,I originally had thought the same thing,in fact it is what i had always done in the past,but the last house I did that was similiar, the oil base primer formed an impermeable film that became brittle and cracked and broke into large chips.I thought maybe the 123 bullseye latex primer would breathe and flex and not cause a rapid peeling problem.Just my opinion.Thanks Doug

If the primer failed in this manner, I would then consider what was the condition of the surface before priming? Was it bare wood? Was the wood grey and weathered or contaminated at all? Oil primers should penatrate into the surface of the wood slightly (would do the same for a number of other substrates as well) actually giving them better adhesion than most latex primers. Also, large amounts of moisture getting into the siding in other places could have caused the peel. Too many factors to say without seeing it, and even then you can only make an educated guess.

My $0.02....

KellyPainting · 08-03-2006, 04:29 PM

I've had alot of succes w/ oil primers....but you got to apply to a bone dry house...otherwise your trapping the water... and remember...oil dries from the inside out! not like latex (from the outside in) so on hot days... it might take a day or two for the oil to set up correctly...

Brushslingers · 08-03-2006, 05:11 PM

Quote:

Originally Posted by AAPaint

If the primer failed in this manner, I would then consider what was the condition of the surface before priming? Was it bare wood? Was the wood grey and weathered or contaminated at all? Oil primers should penatrate into the surface of the wood slightly (would do the same for a number of other substrates as well) actually giving them better adhesion than most latex primers. Also, large amounts of moisture getting into the siding in other places could have caused the peel. Too many factors to say without seeing it, and even then you can only make an educated guess.

My $0.02....

Exactly, ever sprayed oil on a latex ceiling? Nice spiderweb cracking effect, much like Faux. Most likely your dealing with some sort of moisture or someone before you running oil over latex.