Paraloid B-72 as a size/sealant?ApproveRejectUn-ApproveSubscribeUn-Unsubscribe
Question asked 2017-09-19 15:24:31 ...
Most recent comment 2017-09-19 21:34:59
Sizes and Adhesives
I've mentioned this in another thread, but haven't actually phrased it as a question, and I am curious what the MITRA folks think about using a thin sizing of Paraloid B-72 to reduce the absorbency of either Claybord or traditional gesso, prior to painting with oils. I mean, I know that it works, from a process standpoint, but is it a sound practice?
My own research on Paraloid B-72 suggests that it is one of the more stable synthetic resins and is not prone to yellowing, but like all acrylics, it is somewhat sensitive to solvents. Then again, it's incorporated into the ground (which in the case of Claybord, already contains acrylic resin), so is it really any worse than painting on an acrylic primer?
Answers and Comments
you write is perfectly logical. It will cut the absorbency of a true gesso
ground while changing its characteristics and making it slightly less water
soluble (also less friendly for egg tempera) . B-72 is no worse, and generally
better than most of the acrylic polymers used in synthetic binders. It will
remain soluble in the same solvents that it was initially soluble in. That is
both its virtue and a slight deficit for other reasons like these. For most
situations that you mention, it should be an admirable sizing layer.
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