I recently encountered this article on Make Solid’s website: 3 Things Wrong With Your Vat
http://blog.madesolid.com/2014/03/3-things-wrong-vat/
The section that interested me was: 2. Component Diffusion into PDMS.
Their article does make it seem that leaving resin in the tray does irreparable damage to the PDMS layer due to the resin contaminating the porous PDMS.
Anybody have any thoughts on this?