Ever since I discovered I could buy it in 16 oz bottles, about almost two years ago, I have since bought a total of three 16 oz bottles. So far I have been able to go through all of them just fine without them going bad. I do keep it in the fridge though. The first two bottles I tried were from a company on eBay and their glue is fantastic. They charge about $36 a bottle. I then found another company that sells 16 oz bottles for $28 shipped. That same company also sells CA by the gallon as well for those serious builders out there.