Presentation and Conservation
I insist on acid-free mats. If I can't cut them perfectly myself, I have them done by a professional.
I use frames on all of my canvases. [Yes, I realize that frames might interfere with your aesthetic, but even a strip frame can help prolong the life of a painting and keep it from needless scuff marks and “bruises,” particularly if you work in large scale.]
I keep works on paper (including fiber) out of bright light and protect them with UV-filtered Plexiglas or glass.
I never attach “gallery lights” (common in home decorating stores) to the top of my paintings. I realize this heat source will dry out the painting surface.
Excerpted from The Artist-Museum Relationship (e-book and one-hour CD).