For use with spray adhesive by the gallon. You're going to want to designate that use specifically for this gun, because it will never be good for anything else once you put spray adhesive in it.
Keep it in a cool dry place between uses, and make sure it can't be knocked down or tipped over, because one little leak and you have a pile of adhesive you will never actually go clean up. You will just go buy another gun until it disappears under the mess that is your workshop. If you're using the red stuff, it will look like you store human parts in it. Spray adhesive can be easily cleaned however using acetone or thinners.