In order to simplify things I decided to see if I could create a nice white border around the edges of my paintings. To achieve this I masked off the edges with masking tape. Unfortunately, I found that if the tape is left on too long it tears the paper.
So I bought some low tack tape and decided to give it another go. Thankfully this time it worked. That means I can store my paintings flat and present them in a way that is pleasing to the eye.
This is the result..