estebanana -> RE: Another victim of dry weather... (Feb. 12 2017 2:08:41)
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quote:
John-- I wasn't saying that, but I will now: Titebond glues very well to itself. This is well known. But Titebond (yellow glue) is aliphatic resin glue, and PVA (polyvinyl alcohol) is white glue and I don't know whether it bonds well to itself or to Titebond. Titebond is a modified PVA glue itself. As for it being a widely held notion that you are safe to reglue over Titebond, I find that highly questionable. The proof is in the pudding, if you have repair work that sustains after being reglued over Titebond so be it. There are many technical problems with regluing joints that are not cleared of an old glue. Hide glue is one of the few glues that can sustain being reglued over itself and that is one of the reasons it's valuable in repair shops. One of the maxims you hear over and over when being taught to repair is don't reglue over white glue - of course it also depends if you get taught by violin repair people or contemporary guitar makers. Not that I'm trying to tell anyone how to do it, but after having used hide glue since 1978 when I was first introduced to how to use it, and having used many gallons of Titebond for various non guitar making jobs, I'm skeptical of regluing Titebond over Titebond in every repair condition.
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