According to this link [ Ссылка ]... ,
using opaque acrylics like I have been with a gesso-only technique has been fine. But if you’re looking to use other mediums like oils or transparent paints, a primer/size needs to be applied.

Gesso-only prep has worked well for me all the years I’ve been using the technique, and I’ve gotten to visit some old pieces that looked great! But I’m always looking to improve, and I’ve added GAC 100 to my routine for even more insurance that my art will last long.

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