http://www.esao.net/How to paint oil on wood?
You need to prime the wood in some manner before painting on it.
This is for two reasons.
Firstly, it provides a good layer for which the painting to adhere to.
Secondly, and most importantly, it prevents the wood from swelling in adverse conditions.
The fluctuations in humidity in the average home will cause the grain of the wood to swell and contract over time.
This in turn will cause the painting to crack.
By priming the surface, you seal off the wood from the moisture in the air.
Ideally, it is best to prime BOTH sides, front and back, so that moisture does not enter from the back either.
Priming both sides also causes equal surface tension and prevents the wood from warping.
You can prime it in either acrylic gesso, or a coat of oil primer (provided the final painting will be in oils).
Many favor an oil primer, because unlike gesso, it does not cause the grain of the wood to swell during it's application.
The gesso, after all, does contain water, and ultimately, that is what you are trying to keep out.
The most common woods used are untempered masonite and birch plywood.
They are of high quality, and show minimal grain.
Esao and I went to school together, and we always painted on masonite for class.
I assume he is still using similar methods.How to paint oil on wood?
the only thing you have to do to the wood is put a layer of gesso on it. you can basically paint with oil on any surface, as long as it has gesso on it to prime it.
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