Mujitsu and Tairaku's Shakuhachi BBQ

dstone wrote:

Is anyone aware of how this stuff might age or break down over decades?  It's an acrylic resin.  Discoloration doesn't bother me as much as outright separation/crumbling/cracking.

I used it (Hot Stuff, specifically) for 20 years for stringed instrument repair. Most applications were within a glue line between two materials, but also used it often mixed with wood powder to fill wear divots in fingerboards, and it seemed very stable--the fills were even harder than the original fingerboard material. Also used it for pearl inlay work, with the same good results.

The accelerator that is sold with it in spritzer bottles actually increases its bond strength and durability.

eB

Cyano is very durable and 'timeproof,' at least as much as anything else. Flaking off is less a condition of the adhesive than of the application, IMO. I personally wouldn't use it for utaguchi work because the area is close to my mouth (but when fully cured this shouldn't be an issue). I mistakenly got a few drops on the sanded, raw root end while applying a decorative rattan wrapping and it does seal the wood nicely.

True, but in my experience it can sometimes create whitish 'frosting' on nearby areas (even after it's cured, apparently). I'm not sure if this is due to outgassing or what. Forensic analysts use the 'frosting' property for sealing fingerprints on evidence.

It's probably safe enough, but I prefer the feel of unfinished bamboo. I do sand to a fairly fine grit which gives a very smooth surface.

Regarding cyanoacrylate:

Although I have used it for this (as in small finish touch-ups on guitar repairs), CA is not at its best as a surface coating, but in adhering two intimately-contacting surfaces together. It loves a basic pH best and is more unhappy in an acidic environment. All things in the gluing environment being equal (moisture level, pH, surface cleanliness, etc.), the thin runny type of CA is stronger (assuming the surfaces fit very well) than the gap filling gel variety. It's possible to achieve bond strengths of up to 5000 psi with CA.

CA uses an anaerobic process to achieve a bond: In the absence of oxygen, off it goes. That's why it works so very well in sticking two fingers together very quickly...  Another way to stimulate its bond reaction is to apply it in the presence of baking soda (very basic)--great for filling gaps with rock-hard material, if you don't care if the filling is white. Accelerators in mist spray bottles are also available for curing surface applications, which are generally slow-curing since oxygen is present.

eB

Last edited by edosan (2006-06-25 12:17:29)