I was wondering if there’s any benfit to using a layer of alkyd resin like Galkyd to help seal a painting? Will it help reduce moisture absorbtion?
I would apply it as the last step before painting, so my process would be: size wood panel using gac 100 x2 layers, adhere fabric to the panel with beva film, size fabric using gac 100 x 2, gesso or oil ground layer x2, and then 1 layer Galkyd and Gamsol 1:1 ratio to cover that. I would be coating the entire panel front and back, including edges.
Is this overkill or is this a good way to do it? I just want to get a smooth and as warp resistant panel as possible. I’m using the cotton canvas overlay so that if the panel is ever damage the painting can be taken off, instead of having it painted right onto the wood.
It is probably unnecessary. However, It could be slightly helpful if the uncoated ground is overly absorbent for the fluid application of oil paint. The slight yellowing of the alkyd should not be an issue as long as the subsequent oil layers cover all areas of the coated ground. However, if applied over an oil ground it will probably create a surface that is too unabsorbent to function as a proper ground.
There may be other, better materials to “seal” the non-image related portions of the panel but any aqueous layers will promote warping. I have no real issue with the use of a fast drying alkyd medium for the purpose you propose as long as the resultant ground retains the necessary degree of tooth and/or absorbency.
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