Can I expect oil painting on Yupo heavy weight to last? Will it eventually chemically bond? Do I have to mount it to a board to keep dry paint from flexing and peeling off? Are there solvents that break down the Yupo substrates integrity? What are the adhesives that work best with Yupo?

My concern is that the oils, once they solidify into a dried layer will not bond. And be susceptible to peeling?

Here is a Yupo "cheat sheet" for your records, see link below. The link includes helpful mounting and adhesive recommendations.

https://static1.squarespace.com/static/5872ac97725e2549f7b2b47c/t/60ad1ebaebd7021b963130aa/1621958361556/YUPO_Adhesive_Report_PDF

Regarding the oils to last, YUPO is a totally inert material and therefore is completely archival. However, the composition of the oils being used will ultimately determine the painting's overall longevity.

To answer your initial chemical question, it will depend on the materials you are using.

If you're applying a heavy layer - it will be susceptible to pealing. With oils in this case it's best to spray a fixative afterwards. I know some artists use Krylon as an example. It's always best to test first of course. I'd be more than happy to send over samples for testing.

I used Sennelier fixative for my chalk pastel work and my contencrayon work on the Yupo and it works well. So far. But those are very thin layers of dry pigment. Well it sounds like I need to do some trial paintings to see how they age.

I’m very intrigued by the way YUPO makes my sensitive drawing techniques easier and more detailed. I can erase highlights and create beautiful detailed work with lots of values due to the slick surface permitting lifting of paste