1

I'd expect so, but thought I'd ask, anyway. This is similar to sizing, but the dilute mixture would be the only thing that was applied

I'd also assume/expect that diluting it too much would defeat the purpose of the glue, so friend's intent was only to dilute by about 10% or so.

I guess the real question is: is diluting glue to increase open time a good idea at all, and if so, what is the limit of dilution?

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    What type of glue? – CoAstroGeek Jan 30 at 16:18
  • Titebond 1 or 2 (I assume). PVA for sure. – mblatz01 Jan 30 at 17:44
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    Is there some reason you can't just use an off-the-shelf product with a longer open time? Titebond 2 Extend has a 15 minute open time. Or you could go to a slow-set epoxy and have like 20-30 minutes. – SaSSafraS1232 Jan 30 at 19:46
  • Not me...that was my advice. Some people would rather save $10 and ruin their work than vice-versa – mblatz01 Jan 30 at 20:06
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Actually no, dilution doesn't really extend open time. In fact oddly, diluting a glue can make it go off faster because water evaporates (or is absorbed by the substrate) faster from a fluid mixture than from a more viscous one, and by their nature more watery mixtures tend to sit more thinly on the surface to begin with.

Franklin (makers of Titebond) used to say in their FAQ for Titebond1 that they can be safely diluted by only 5%. From experience in related areas I expect this to be conservative, but rather than face a glue-line failure it's probably best to treat this as gospel.

If you need a much greater open time than that provided by a given PVA it's better to look into using a different adhesive. Epoxy and foaming polyurethane are two of the commonest choices, room-temperature hide glue and urea-formaldehyde are also good alternatives for specific applications. Note however that clamping needs for each of these glues is not quite the same as with PVA, so some adjustment in your procedures may be needed to get the strongest joints possible2.


1 This information appears to no longer be given on their website.

2 Epoxy for example is one adhesive where it is possible to starve a joint with high clamp pressure (something that is essentially impossible with PVAs, despite the widespread belief among woodworkers to the contrary).

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