Two Part Foam ?

[Mark in IL]

I was wondering what you guys and gals would consider the shelf life to be on some opened two part foam.  I just made a base with some I have had around for a long time and it didn't expand like I thought it should have.  I need to buy some more and I am wondering that if I buy a gallon of the stuff, will it lose its properties in say 2-3 years if I use it at different times during a three year period ?

Thanks - Mark

[DropTine]

Are you sure it was mixed up properly? Just wonderng, Iv'e had mine for over 6 years and no problems. Mark

[Mark in IL]

Hi Drop Tine -

Yeah I am pretty sure it was mixed right.  I used a wooden craft stick but next time I will try the wire in the drill maybe that will help.

[Doug Bridges]

Manufacturers say 6 months. I would say a year Max. After that its a crap shoot.

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[Buck N Duck]

I just bought a couple of gallons and the instructions said to use within 3 months. Lots of variables go into how much it expands including the humidity and temperature.

John

[Jimmy Rimrock]

Anything that comes in a metal can is in there for a reason. 

My experience with foam shelf life is 2-3 years, maybe a bit longer if you can keep the lid sealed.  Wipe down both parts of the cap with acetone and try to keep it sealed, and LIKE ANYTHING, store in a cool, dry place.

Spent a few bucks and buy a high quality stirring rod, a piece of bent 12 gauge galv wire doesn't cut it.  I bought one at the local pottery store.  Looks like a propeller with a ring on it about 2 " in diameter on about a 3/8" shaft, made of stainless.  Makes a huge difference in the quality of foam, I wouldn't mix foam without it. After mixing, spin it in the trash can to "fling it" clean while spraying a little acetone on it.  Ready to use the next time

Good Luck

[Buck N Duck]

X2 Jimmy...... The wire didn't do anything for me and the foam wound up being soft after it set. The second batch I did worked a lot better but I used tongue depressors. Watched as the color changed to be uniform and then waited until it started to rise before I poured it out. Used a paintbrush to spread around and by breaking the surface I got some great texture. Better to mix multiple times than to try and do in one mix.

John