Back in 2009 I purchased two tubes of FlameMaster sealant from Vans. I was going to use this for sealing the firewall of my Rocket project. As it turned out I ended up using some left over ProSeal an acquaintance had and both tubes went unused.
I noticed that the plastic bag the cartridges come in states that the shelf life is 6 months but may be extended by refrigeration. I thought I might as well put them into the freezer - my thought was that this should extend the shelf life even further.
And there they sat until last Saturday when I pulled them out of the back of the freezer where they had been for 5 years and decided to see if the material would still cure. Once both tubes had come up to room temperature I mixed them according to the instructions.
Lo and behold in 24 hours the contents of both cartridges had set up tack free - I had forgotten how much that stuff stinks - and to all appearances it has now cured as I would have expected fresh material to. Not that I would have used it for sealing tanks but it is an interesting data point.
So I think the statement about refrigeration prolonging the shelf life is true, and even more so for freezing!
I noticed that the plastic bag the cartridges come in states that the shelf life is 6 months but may be extended by refrigeration. I thought I might as well put them into the freezer - my thought was that this should extend the shelf life even further.
And there they sat until last Saturday when I pulled them out of the back of the freezer where they had been for 5 years and decided to see if the material would still cure. Once both tubes had come up to room temperature I mixed them according to the instructions.
Lo and behold in 24 hours the contents of both cartridges had set up tack free - I had forgotten how much that stuff stinks - and to all appearances it has now cured as I would have expected fresh material to. Not that I would have used it for sealing tanks but it is an interesting data point.
So I think the statement about refrigeration prolonging the shelf life is true, and even more so for freezing!