Glue stength

[Desparad0]

I have heard alot of hype about these polyurethane glues (gorilla,etc)but are they that much stronger than the PVA glues?
Response from anyone who uses/tried these glues would be appreciated..

[Lou_williams]

They are stronger but that is not the point on these glues. Used properly the PVA glues will be stronger than the wood that it is holding.

The Gorilla type glue's work better in applications that might b e exposed to water. I have used them where I wanted to make sure that I didn't mess up the glue.

I built a couple of beds a couple of months ago. The rails are about 3 feet above the ground so that there is storage under the beds. the legs were made with 12/4 stock, and the rails out of 8/4 stock. I had to glue up the rails under the headboard because I miss calculated the amount of 8/4 stock. I used Gorilla glue and it worked great.

PVA should have worked as well, but, I just wanted to make sure.

[MadMark]

"Stronger" is a relative term. Your old standby "carpenters yellow" will form a bond stronger than the wood. Once you're beyond the wood failure point does it really matter how far you're beyond it?

The reasons for using alternate glues are not normally issues of strength, but of cost, application method, pot life, work time, setup time, water resistence, etc. Most any of the glues, properly applied will be stronger than the wood itself.

M

[Burt]

The yellow carpenters glue is stronger than the wood. I do cabinets and glue up doors and have verified many times that the carpenters glue is stronger than wood. Why spend more???

[Bill]

Well, they ARE very strong, waterproof and moisture activated. I don't think the strength should be the issue. It's the 'use" that should determine whether you use a "poly" or "yellow" glue. I have NEVER had an item glued with yellow come apart so I have no way of knowing whether poly would have done a better job. :{)

Bill