I use the 3M vellum adhesive, sometimes you do see a little bit showing through, but not always. I do try and put it behind the words or picture I have on the vellum and then I never notice it. You could also run it through a zyron then the adhesive is on the entire surface and you wouldn't notice any spots. I also use brads or eyelets to attach it to a page, then there is absolutely no marks.