Yes, I recently purchased some smooth on because of the same concerns. If the air conditioner is not on in my shop this time of year it will get to an easy 110- 115 when its 95 or so outside!On the smooth on site, (googled it for manufactuer specs.) it does state that you should use it as soon as possible. I have 2 quarts Im gonna throw away and store all my glues in the house. To much work and money goes into producing a bow, to skimp on the glue. It is the most important component of a glass bow. A delam could be dangerous, dont want someone to loose an eye over 30 bucks. The unopened cans I had sitting for 15-18 months in my shop had started to seperate. I compared them to the stuff I just got and there is a difference in how it looks and I think the resin part didnt smell as strong.In the trash it goes! Instead of quarts, this time I just bought a pint. Best of luck -Greg