Thread: Build Log light weight project
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Old Dec 17, 2012, 04:23 PM
Charlee is offline
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Templeton, CA
Joined Jan 2005
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CA brittleness

Quote:
Originally Posted by kenh3497 View Post
FWIW....

In the Balsa Builders forum there was a discussion about different glues. Some of it directed at edge joining balsa sheets. Just wait I'll get to the point Anyway the discussion was how hard it is to sand a CA joint and get a smooth surface. One MFG suggested you sand as soon as the joint is cured as as the CA continues to cure becoming harder and MORE BRITTLE over time.

Ken
The point made in that forum was that CA was much easier to sand if you don't wait an hour or more before doing it. Someone then speculated that CA continues to get more brittle over time, which is not true to a significant degree. After 12 hours (usually less), CA will be as "hard" as it will ever be. Tests have shown that quality CA will loose about 15% of its strength after a ten year period.
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