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do we really need to seal the wood for oil painting? ApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2023-05-06 00:01:10 ... Most recent comment 2023-05-07 00:37:55
Acrylic Art Conservation Topics Oil Paint Rigid Supports

​Dear Mitra community,

i want to ask do we really need to seal the wood for oil painting? i am using acrylic gesso ground and oil painting on top of engineered wood panel, called Masonite tempered hardboard. 

from one online source, i heard people saying wood had to be sealed before applying any acrylic grounds, because acrylic product had water, if wood is not sealed, the water content will wrap the wood immediately. but the source not specify which product is best to seal the wood that bonds acrylic ground well.

and i also see people suggest to use gloss acrylic medium to seal/"size" wood panel before apply acrylic gesso. however i think all acrylic is porous, so not sure how gloss medium can really seal the wood? even it could, its water content will wrap the wood first?

in addition, i see Golden is now advising not to use gloss medium any more if for oil painting, they suggest to apply acrylic gesso directly in several coats. then the question will be if apply acrylic gesso directly, will it seal the wood? or its water content will keep wrap the panel in each layer?

finally the thought is do we really need to seal the wood and what is the best product to seal the wood? can acrylic gesso seals the wood and act as ground as Golden suggest is a good practice?

thank you. 



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User Comment

[2023-05-06 02:27:55]

Hello there,

The purpose of sealing the surface before painting isn't just a mechanical safety against the effects of humidity or condensation making it move, it's also to prevent a lot of colourful molecules from the natural surface (wood or cloth) from migrating through your pictural layer and staining it.

Golden has done extensive work on that aspect. I'd follow their advice. 

The issue with wood surfaces to paint on is that there are as many varieties as there are stars in the sky, each with its different risks or properties. Some might not require much precautions but as a rule of thumb, just seal them.

Acrylics in general are microporous but that varies depending on their polymer, formulation and drying conditions. This means that it will generally let humidity (gaz) flow through and the surface breathe, but will prevent water (liquid) from sipping through (with all it may carry back of tanins and stain from the surface). Gessos are meant to be more porous to give good 'tooth' to the next layer, so they are mechanically less effective as stain blockers.

The cheap option is to dilute slightly your gesso to give the first impregnation stain to the wood and when it's properly dry to go for the next layer. (and then a third to correct remaining defects and smooth it over). That may work depending on the wood kind, the quality of your gesso and the quality of your priming work.

Cheers and good painting,

Lussh


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User Comment

[2023-05-07 00:37:55]

Hi Lussh,

thanks for your comments. discoloration is not an issue for me as i never experience it and painting in oils doesnt get it affect anyway.

​what i concerns is in practice the water content in acrylic product wraps the wood, no matter it is called acrylic size, gloss medium or gesso, they all wrap the wood same way. so i not sure if they really seals the wood from water in following layer to wrap the wood further. 

And there many professionals had opposite saying, like one said wood had to be sealed before it can be applied any acrylic gesso ground. to seal it. however from Golden, they saying do not use any gloss medium under oil paints. 

so if we follow Golden's advice, can acrylic gesso seals the wood same as "size" that prevent water content from following layer to wrap the wood?

hope experts like you can help to clear out. much appreciated. 


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