I like the size of this template you can use any kind of Ink and Sprays on this some will come off easily others like your Heidi Swapp Color Shine sprays. It'll stain a little bit. But it's not a problem for me if it stains a bit. I hear you can use gesso or other mix media paint on this. I haven't tried any gesso paste since I don't have any. But plan to try some of my acrylic paints see how it turns out.
I have no complaints about the product itself but if I had a second chance I believe I would choose the 6" x 6" template because I believe these bricks might look too big and clumsy on my 12" x 12" layouts