Primers will not go bad if stored properly in a cool dry environment. I’ve had primers since the 80s and still function fine. I’ve had some primers that were bad but due to a factory issue not a storage one. I was out shooting some reloads yesterday in a 6.5 CM comparing them to some factory loads.

Best Overall: Tatcha The Silk Canvas Protective Primer at Amazon. A Byrdie fave, this primer has a silky finish and makes skin look smooth. Best Budget: The Ordinary High-Spreadability Fluid Primer at Sephora. A serum-like formula, this affordable primer enhances complexion and ensures foundation goes on smooth.