Iv'e been working on a variety of papers, settling on Canson's XL Watercolor paper, for a variety of reasons- it works well with the watercolors I'm using, it's cost is nice and it has a relatively smooth surface that my pens rather like. It's also got 2 sides, a right and a wrong, ot a front and a back; which ever way you prefer to call it, but I like the judgemental aspect of right and wrong… In this case. Any how.
One side has a little more tooth an grab to it than the other, this is the right side. The reverse side AKA WRONG is smoother. It also has less sizing… This affects a number of things- how ink and paint react with the surface. Less size means it's more absorbent.
This is good and bad.
It's bad when you use a mask. I applied a liquid frisket rather heavily to the surface of one of my paintings and the frisket grabbed to the paper so strongly it ripped when I removed it. Quite badly. It was crazy frustrating.
I went ahead with the mixed media piece anyway, knowing my paint would adhere the ripped pieces down and it would be okay, but I had to change my plans for color and other ideas for the image, and I know that the torn piece could come back to haunt me.
Additionally in my frisket/mask adventure I've found that the frisket REALLY doesn't like the spray inks. If the frisket is too thin the spray ink "leaks" through it. A total pain in the ass. So I've learned to put on one thin coat and then a heavier coat to seal it all up.