Time to share now that I've used it a few times:
On the aluminum panels made of composite material, I cover the back and sides with Painter's Mate Green tape that sticks very well. Less messy to cover than using the Frisket Masking fluid. The Saran protects the easel. The Frisket protects the sides while painting and just rubs off easily afterwards.
Merry Christmas folks! Golly, another year!