Need some help with some sort of paper mache type project I'm thinking about doing.?

I have a collection of drawings that I've done with watercolor pencils (not paint!) which were outlined with a pilot, rolling ball ink pen. I don't want to frame them or anything so I was hoping to make a collage type of thing with some sort of paper-mache type technique. I want to put some sort of gloss or glaze or something over top to keep the color in tact and hopefully protect it from water and other random things. However, It would need to be something that won't warp the colors or smear them when it is being put on. I would like to make it on a canvas if possible. Any suggestions? Specifics for how to do it are appreciated!! Thanks!