Does anyone out there know a good fixative or sealant for colored pencil drawings, especially Prismacolor? I have a smudging problem in my sketchbook and I hate it! If i can get pictures of this, i'll edit in an example. So, if anyone knows a good brand or alternative, I'm all ears! I'm currently testing an acrylic sealant that I've used successfully on figurines and a pastel drawing in the past, not sure how it will do but I have high hopes. If you give a suggestion and it works, thank you!