The difference between working with egg tempera on paper versus a panel. My first painting of 2021 was an egg tempera on paper primed on both sides repeatedly with Sintopia then I used PVA to attach it to a piece of thick, acid free, mountboard. I pioneered this support (for me) last January and sort of enjoyed working on the surface. I liked the outcome. One of my friends wondered why the pieces painted on paper were brighter than my panels.