Robert:
CA = Cyanoacrylate glue (i.e. "Super Glue"). However, the grade that is used for R/C aircraft building is far superior to the kind you usually find in the hardware store or Wal-Mart. Brownell's carries the "Hot Stuff" brand, which is an R/C product and works fine, but my favorite brand is the premium brand under the "Zap" label. In many years of R/C building, I found it to handle really well.
CA comes in several viscosities. The two that are most useful are the thinnest one, and the medium-viscosity one. The thin formulation will wick itself into cracks that you can't even see (and across your hand and down your elbow before you realize it). It also works well to seal the inletting, or even toughen up "punky" wood that wants to tear instead of cut when you are doing checkering and such. The medium-viscosity is more useful when there is any more that a few-thousandths gap in the fit between the surfaces. If you are replacing a piece of wood that has broken completely off (but still fits well) it would be the one to use. The thin is best for stabilizing the kind of cracks that stay closed on their own. The very-thick formula available I never use, choosing to go to AcraGlas if it's that bad. In the "Zap" brand, the thin formula has a pink label and is just called regular "Zap". The medium-viscosity product has a green label and is called "Zap-A-Gap". The Hot Stuff brand that Brownell's carries is also available in thin and medium viscosity.
Jim
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