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Hello! I am looking to manufacture canvases and have received feedbacks from artists. 

I was always curious as to why ​certain artists liked to prime their own canvases, and a lot of it seemed to do with the current pre-primed canvas market. 

The problem being 2-fold, sizing and gesso. 
Nowadays canvases are not sized but extra layers of clear gesso are added to stop oil from seeping through. My question regarding this is – is clear gesso a good alternative to PVA? How does it perfrom in terms of archival purposes? 
Triple primed gesso seems to be the norm. What are the biggest challenges about it?

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