I have painted our lake in all seasons. Tomorrow, my "October Lake" will ship to new owner M.G. I thought you might be interested in my packaging for your own use. I taped the painting to archival foam core then cut strips of the same 3/8" foam core to fit all around the painting like a frame. this 3/8" insures that nothing will touch the image surface when I place another piece of foam core on top. I may choose different packaging methods for different surfaces. For Pastelmat, a piece of glassine or poly sleeve works well because that paper is super "grabby" but this method works for all papers especially if the surface is somewhat textured with my pastel spattering.
I have posted three paintings from my 2016 Rock Creek Series on the eBay auction at 2016 prices.