
Collage can come in so many forms and in the DIY culture you can take every day items and make fun collages to hang on your wall, cover a small box or make a pretty greeting card.
Here is a quickie guide to different types of glues widely available and tips on the best substrates to use and why some glues are better than others depending on what you are doing. I've tried all of these glues myself, in different environments and tested on a lot of different substrates.
1) Elmers Glue Stick - You should be able to find this anywhere from the grocery store to a craft store. These are great to travel with and they dry clear and are perfect to use for greeting cards or small collages. Once dry this glue holds up well but isn't archival if you are working in fine art. This glue stick is also best used on magazine, newspaper or copy paper weight paper. If you get some curling just take a piece of freezer paper, slick side against the glue side and press under a couple of books. I've tried several generic brands of glue stick and honestly never found one worth using.
2) Mod-Podge - This is a great glue on stretched canvas AND it seals well. However, because it is a wetter glue using it on a paper substrate (even heavy weight papers) you are going to have a hard time getting it to dry completely flat. Again, you should employ the freezer paper trick from number one above. If you want to use mod-podge as a sealant it works great but you really need a heavier substrate than paper so as not to get curling of your piece. I highly recommend wood, canvas or a 1/2" foam core board as your substrate.
3) Yes! Glue Paste - This is a very thick paste and works best using a hog bristle paint brush or palette knife and doesn't work well with a sponge or brush with soft bristles. A great all around glue for any substrate and as you work it the paste will become warm and easier to spread. Very sticky and dries pretty quickly. If you are covering a large area such as a canvas you'll need a scraper/palette knife to manipulate. Once you place your paper on this glue you have to be quick if you need to reposition it.
4) Golden Gel Medium(s) - Most artists I've spoken to prefer the gel mediums to attach everything from paper to buttons and all kinds of objects on to a substrate. There are 10 different gel mediums from Golden but I personally prefer the Heavy Gel Matte. I use this as my "go to" glue for most everything I do. I use it on canvas, wood, stone and most recently I've become a fan of Strathmore Illustration Board. The gel is heavy enough to glue coins, buttons, small bottles and other small objects on to vertical surfaces.
There are many other types of glues and adhesives available for more specialized surfaces and usages such as jewelry, metal arts, altered art and mixed media. I'll cover some more kinds of glazes, resins and industrial adhesives.