How to convert latex-based paint to oil-based (alkyd) paint?

4457 Views 6 Replies 4 Participants Last post by chrisn, Jul 2, 2009

ohman

Discussion Starter · Jul 1, 2009

Dear all:

We have a home improvement project and currently we painted the wooden door (interior) and door trim with the same type of paint as the wall (to be more exact, it is Kelly Moore 550 Super Latex Eggshell paint). However, as the door trim (and the door) was originally painted with oil paint (I think), so the original "white" color of the trim still can not be fully "covered" with the KM 550 Super Latex paint. So currently we are thinking of repainting the door and the door trim with KM 6630 Alkyd Oil Base Semi-gloss Enamel Paint.

My question, as we just painted the door and the trim with 550 Super Latex as the finish coat, do we need to prime it again in order to apply the new KM 6630 Alkyd Oil Base Semi-gloss? If so should we use the oil-based primer, such as the Kilz "original" primer (oil-based)? What would happen if we don't prime it and directly put the KM 6630 directly on top of the 550 Super Latex paint? Thoughts or comments?

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Bob Mariani

· #2 · Jul 1, 2009

you need to prime with oil based. If not the paint will simply peel off.

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chrisn

· #3 · Jul 1, 2009

If I am reading this correctly, you have applied latex on top of oil and want to make it right?

The only way to correct it would be to remove the latex back to the oil and then apply your fresh oil . Sorry

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ohman

Discussion Starter · #4 · Jul 2, 2009

chrisn said:
If I am reading this correctly, you have applied latex on top of oil and want to make it right?

The only way to correct it would be to remove the latex back to the oil and then apply your fresh oil . Sorry

Hi Chrisn, thanks for the reply. How do I remove the latex paint by the way? Thanks again!

By the way, I believe that the door trim was originally "oil-based" paint. To save time I told the painter to apply (1) KILZ Premium primer (water-based) as the base coat, then top coat with Kelly Moore 550 super latex interior paint. Since now the 550 has totally dried, should i still try to remove it first and if I can not remove it, can I apply oil-based primer such as Kilz "original" primer (oil-based) then top coat with Kelly Moore oil-based semi-gloss finish interior paint (such as 6630 Alkyd Oil Base Semi-gloss Enamel Paint)? Thanks!

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Matthewt1970

· #5 · Jul 2, 2009

That latex should come off pretty easy. The latex Kilz you put on there probably won't help it stick as that stuff is really only good as a drywall primer. If it doesn't come off very easily then you probably didn't have an oil based paint underneath.

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ohman

Discussion Starter · #6 · Jul 2, 2009

Hmm... it doesn't really come off easily. So can I assume that the original paint (on the trim and the door) were latex-based? Is it normal that people would use latex-based paint (semi-gloss) on door trim and doors (interior)? Thanks!

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chrisn

· #7 · Jul 2, 2009

First off, you need to determine what is the first coat, oil or latex. If it comes off with goof off or rubbing alcahol it is latex and you have no problems. Forget the Kilz completly.If it is latex, scruff it up, clean it and paint whatever you want.If it is oil,scruff,clean,apply a GOOD bonding primer( latex or oil,it does NOT matter) and paint, unless you are using oil as a finish coat, then you can skip the priming.

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