I'm making a collage by gluing bits of paper I've cut from magazines to a piece of masonite. What type of glue should I be using for this? I've been using regular Elmer's white glue, but I'm afraid it won't last long term. Also, what should I use to seal the final project?
I would suggest using Modge Podge to attach the paper to the masonite. Actually any white glue would work but Modge Podge is thinner, easier to spread, and has been developed for that purpose. To seal it you could give it a topcoat of Modge Podge. I believe you can get either a gloss or matte version.