CA Glue bad? How to tell? - RC Groups
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Sep 15, 2001, 11:29 AM
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CA Glue bad? How to tell?


What happens when CA goes south?

I've got some Hobbytown foam-safe CA that seems to take forever to set when used to glue polystyrene foam. I've come back 10 minutes later to find it still liquid in some joints. Yet in others it seems to set in a minute or so.
What's going on? Is it old or just crappy CA?

Kevin
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Sep 15, 2001, 08:41 PM
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Kevin Murray's Avatar
I had a bottle of thin CA go bad. It got thicker, dried much slower (min. not seconds) and it just wasen't as strong.
Sounds like yours is bad. But then I have never used foam safe CA.
Sep 15, 2001, 09:40 PM
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I've had a similar experience. the foam safe stuff doesn't seem to work as well as the regular.

As Kevin said, if its thicker ( or discolored ), its over the hill. Toss it.

I suspect that a lot of the foam safe CA is older than the regular stuff because they don't sell that much of it compared to the regular.

But, if it did set in some places, the CA is probably ok, and just the looser fitting parts of the joint took longer to harden.

Dave
Sep 15, 2001, 09:43 PM
Registered User
The foam friendly CA tends to get a little wierd about how it sets. I think this is due to the need for moisture to be present to cause the glue to catalyse. Kevin M is right about the thickening issue. If the viscosity changes, dump it.

Ed