How long does primer last after opening. In most cases latex. Smashbox Photo Finish Foundation Primer Makeup Artist Tips Makeup Primer Foundation Primer When the paint can is bulging or the lid is puffed up you know its bad says Enrique de. How long does primer last . This fits in with my previous experience of primer. I will load a few up to see what happens to start with. Once any material has been exposed to the atmosphere the shelf life can be shortened dramatically depending on the resin base. In addition its always best to read the instructions that the primer came with. Find What You Are Looking For. One provider for primers send it in water by regular post office. I wonder if they are still any good. Ad Find results for Filler primer on Finecomb for Singapore. Im talking about Smashbox Photo Finish Foundation light by the way. Liquid on the top and solids. When stored properly an unopened can of latex or oil-based paint should have a shelf life of...