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You have to start sanding right after it sets.

November 14 2017 at 12:44 PM
Ken Lilly  (Login amplifone)
HyperScale Forums
from IP address

Response to using cyanoacrylate glue as a filler/putty replacement...

CA glues set then fully cure over time to reach the full hardness, 24 hours later it's a lot harder to sand than it would be 1 hour after it sets.

Talc can be added to make a putty/paste to fill larger gaps, it also has the benefit of being easier to sand than straight CA. Something I've done is to mix up a putty out of CA and talc and use it to remold the trailing edge of a wing for example, I'll let it set and then sand it to shape. Then I'll apply a thin coat of the extra thin CA over the area for strength. It fills in any small voids and helps to strengthen the area.

Since CA cures chemically and not by drying like any of the solvent putties you dn't have to worry about thick applications taking forever to dry or the underlying plastic staying soft because of the solvents. CA is much stronger than the solvent putties so it works well for making sharp edges, and it scribes with a much cleaner line than solvent putties.


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