Thread: "Creeping" joints

Pictures???

If the laminations are bent laminations, PVA glue is unsuitable, due to its propensity to creep. I always use epoxy or urea formaldehyde glue for bent laminations. I have found that PVA glue is liable to form unsightly ridges along the joints when used to glue up panels or table tops, unless the jointing of the boards is near-perfect. For this reason I prefer to use epoxy for panel and table-top glue-ups.

Rocker

Isn't Titebond III a polyurethane glue? Does it creep like PVA?

Thanks for the comments/advice. I'm pretty certain the jointing of my boards are near perfect but I am convinced now that the glue wasn't mixed thoroughly at the time I used it. I will be in future buying my glue in smaller quantities. Thanks again.

Originally Posted by AlexS

Isn't Titebond III a polyurethane glue? Does it creep like PVA?

AlexS,

This URL: http://www.rockler.com/product.cfm?p...4&cookietest=1 implies that Titebond III is not a polyurethane glue; I am fairly sure it is basically a PVA glue. But I am confused by Hunter's Table's reference to 'mixing'. I thought Titebond III was a one-part glue that didn't need mixing.

Rocker

Yep, Rocker, Titebond III is a PVA glue. What I meant by mixing was that I got a 20litre drum of the stuff and didn't stir it before I put it in a smaller container so the glue would have probably separated in the 20 litre container therefore making it weaker and probably the cause of my dilemma!

According to Titebond, Titebond III has a shelf life of only 12 months, or 1 year for the metrically inclined . I had a bottle hanging round the shed for a while, and after about 18 months it had achieved an interesting state - there was a big jelly like lump in the middle surrounded by a runny stuff that looked like the original product. I chucked it.

Like all PVx glues, freezing it also stuffs the glue, so if it was shipped by air & the cargo hold wasn't heated, guess what! Or if it went thru the postal system when it was winter in North America. A lot of stores in the US and Canada refuse to stock or ship PVx type glues in winter for precisely that reason.