Duratex over paint?

[SoundInMotionDJ]

I have some boxes that I will need to paint for an event next weekend. I do not have time to wait for Duratex.

So...I need to paint them now, and Duratex them later.

Are there any problems applying Duratex over exterior grade oil paint? I can add a coat of primer over the paint if necessary.

Thanks,
--Stan Graves

[Sydney]

Does it have to be exterior grade oil paint? What about flat black latex?
In conversation with Duratex people about their elastomeric latex coatings. They said it would go over Kilz primer, and that a repaint over slicker gloss covering ( including oil ) that the surface should be roughed up with sandpaper to give the surface more "tooth" to adhere to.

[Tim A]

Use flat black latex. In addition to the adhesion issues Sydney discussed, Duratex is water based. Duratex specifially says finishing over a flat latex is no problem.

[Jeff Beaird]

Does it have to be exterior grade oil paint? What about flat black latex?
In conversation with Duratex people about their elastomeric latex coatings. They said it would go over Kilz primer, and that a repaint over slicker gloss covering ( including oil ) that the surface should be roughed up with sandpaper to give the surface more "tooth" to adhere to.

Usually a Latex paint will be fine over Enamel or oil based paints but only with sufficient dry time above 60-70 degrees. You have to make sure all of the solvents have evaporated out of the paint. If you painted more than 1 coat, it could take up to a week. And this time of year, especially for those of us that live up North...brrrr. A 70+ degree shop is hard to come by.
I use a red Scotchbrite pad to scuff-up the surface if in doubt.

[SoundInMotionDJ]

I went with Killz oil based primer, with Valspar flat black exterior latex on top. I heavy rolled so there is a slight texture. Overall, it looks pretty good...but it's nowhere near as nice as Duratex.

--Stan Graves

[Mark Coward]

Usually a Latex paint will be fine over Enamel or oil based paints but only with sufficient dry time above 60-70 degrees. You have to make sure all of the solvents have evaporated out of the paint.

Not in my experience, can't use latex on top of oil based paint no matter how long it's cured, but you can use oil on top of latex.

[LelandCrooks]

Oil primer, latex top coat fine. Latex primer oil top coat not so good. Expansion rates are different. Oil primer and latex top I think are the best of both worlds. Latex is far superior to oil in protection. Oil is superior in adhesion. Thus, oil primer for adhesion, latex top for protection.

At least in house paint.

Going to all be moot pretty soon. Oil based paint is going the way of the dinosaur.

[Dave Non-Zero]

If it dont wash out with water, i dont want to know....

[Jeff Beaird]

Usually a Latex paint will be fine over Enamel or oil based paints but only with sufficient dry time above 60-70 degrees. You have to make sure all of the solvents have evaporated out of the paint.

Not in my experience, can't use latex on top of oil based paint no matter how long it's cured, but you can use oil on top of latex.

An oil based paint thinned with mineral spirits develops a dry time of days not hours... for faster dry times use a "hotter" solvent. Such as an auto body reducer but be really, really careful..!!!!
Just make sure its dry, humidity plays a large factor in dry time.
Stick your fingernail into the paint ,not just touching it, to see if it's dry.

[loudsubz]

Just going about painting my cabs now and wanted to get insight on this method as well.

I used CIL Dulux Oil Based on my base coat, I did this last summer so I am sure its good and dry

I just now applied some Glidden Latex FLAT black on my cabs.

I was going to buy a can on Duratex but wanted to make sure this would adhere properly to the later I just applied. I used a regular FLAT latex not a latex primer.

Any adhesion issues between the oil base and latex on top? Don't want to waste money if after putting the duratex on and find it coming off from the latex coat I put on now not sticking to the oil.

[LelandCrooks]

Should not be a problem. I consider the optimum paint job to be oil primer and latex top. Oil adheres the best, latex expands and contracts w/o cracking and is more UV resistant. Duratex is much like latex paint.