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Re: cyanoacrylate and cracks

Author: clarnibass
Date: 2010-10-06 05:01

Pinning started when glues were no where near good enough to hold cracks. This tradition stayed and many still think glue is not good enough because they never tried it properly without pins. When pinning is done with good super glue, it's entirely possible it is the glue that is doing most/all the work anyway.

The critical thing about gluing is the glue must contact the entire side and penetrate all the way. If you add wood dust before, the glue will soak into it and won't penetrate. So you have to use glue without wood dust at first and only add the wood (if you want) at the top.

Pinning alone obvioulsy won't seal a crack. There are several issues with pinning which, although don't happen a lot of the time, can happen sometimes. It's relatively destructive and risky. It's holding the body not so close to the top, not so efficient. Some claim it can help causing cracks in other areas. It sometimes doesn't hold the crack, I've seen properly pinned cracks re-open. I lose more and more hope in pinning and almost never do it now.

Another method is banding. Originally done at the edge with metal rings, now is also done with other materials. It's a bit more visual than pinning (circle around vs. just a few spots) but can look ok. It's most common to do with carbon fibers but that's a bit of a new tradition and I don't think many if anyone ever tried it with other materials (at least no one with an online presence). I intend to try it as IMO the carbon fibers have some disadvantages to working with them. This normally requires a lathe but can be done, if especially careful, without one.

So I would try glue only at first, only then move to other options. You have to make sure the crack is clean or the glue won't... glue.

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