R-tis-tx boards

The R-tis-tx company send me a few of their boards to try out. I tried the watercolor ones first. I've found it to be quite a nice color and texture. Has a pearlescent look to it. Takes the watercolor well. Has anyone else used it? I wonder if I have to put glass over it? Many times I try the same set up again to see how to improve it. It usually ends up that I like something better in each one.
"Watercolor Compostition # 0804", 4x3 inches on board, POR