i was planning on making a collage directly on my wall. i was going to seal it with modge podge. Once the modge podge has dried, if i need to remove the collage how would i be able to do that?
I think this is going to act like wallpaper. Since Modge Podge is basically a glue you could remove it like you would any other glue used on a wall. You can try to steam it first to loosen the glue and then you can scrape and sand it off. It probably won't leave a pretty wall behind so you'll have to repaint and maybe even retexture depending on your wall. Would it make sense to make your collage on a thin substrate and then mount that to the wall (maybe with screws)? It would make removal much easier at a later date. If you've ever removed wallpaper you know it's not much fun.
Hope this helps,