Hello, I have a question about stonehenge paper for making monotypes. I want to make monotypes using oil paint and wanted to know if I needed to prime or add size to the paper before printing with the oil paint? Thank you

In order to create an oil monotype on Stonehenge you must prime the paper with gesso beforehand as it is not sized for oil paint. I would suggest using the 320gsm Stonehenge over the 250gsm version to avoid "waves" in the paper once you apply your gesso layers. Lighter weight papers tend to warp or curl when a layer or two of gesso is applied.

you should add additional sizing to the surface of Stonehenge. Adding sizing like gesso to the surface of cotton papers will help prevent the leaching of oil resin through the sheet to the backside. You would likely gesso canvas before painting to prep the surface, that said most papers are more porous and definitely need a surface coating. Papers like a Stonehenge don’t have enough internal or external sizing to prevent oil resin from leaching through the sheet. Best bet is to gesso coat the surface as you would if you were priming canvas before painting; do a small test first, add your sizing to a small piece of the paper and then throw some oil paint on it to see how it works.