Joints which were glued with Gorilla Glue and then screwed together (on
the boats) easily came apart by prying, the glue failed. I was
horrified when I saw how weak this stuff is.

wrote:
Joints which were glued with Gorilla Glue and then screwed together (on
the boats) easily came apart by prying, the glue failed. I was
horrified when I saw how weak this stuff is.

If the joints were that weak, the screws must not have clamped them
tight enough and the glue expanded. The same is probably true of your
chair repairs. With tight joints, the wood will fail before the glue
does. You CANNOT use PU glue to fill gaps; it says that right on the
bottle. Epoxy is definitely more forgiving and does fill gaps well, but
you can't blame the PU glue if you use it improperly or in the wrong
application.

"Brian Nystrom" wrote in message
news:LT8xe.14504$Q27.5022@trndny02...
wrote:
Joints which were glued with Gorilla Glue and then screwed together (on
the boats) easily came apart by prying, the glue failed. I was
horrified when I saw how weak this stuff is.

If the joints were that weak, the screws must not have clamped them
tight enough and the glue expanded. The same is probably true of your
chair repairs. With tight joints, the wood will fail before the glue
does. You CANNOT use PU glue to fill gaps; it says that right on the
bottle. Epoxy is definitely more forgiving and does fill gaps well, but
you can't blame the PU glue if you use it improperly or in the wrong
application.

But the problem with boats is that you cannot make tight joints most of the
time. It's almost impossible to apply 4kg/cm2 on a joint which is several
meters long.

Meindert

"Meindert Sprang" ) writes:

But the problem with boats is that you cannot make tight joints most of the
time. It's almost impossible to apply 4kg/cm2 on a joint which is several
meters long.

So true. If it weren't for the precision fit on the cheap boats I throw
together, PL Premium would have failed. Maybe my aim is a little better
than Mini-cup builders. Not by much I'd wager. PL Premium expands, fills
gaps, and holds just fine thanks. I've never had to mix it with any kind
of filler as I do with epoxy and did with "plastic resin".


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I admit, my building skills are poor. However, I'd still not reccomend
Gorilla Glue to anybody building boats. I used enough screws that it
should have held better. I also think that if you are going to spend
all that time building a boat, dont you want it to last?

wrote:
I admit, my building skills are poor. However, I'd still not reccomend
Gorilla Glue to anybody building boats. I used enough screws that it
should have held better. I also think that if you are going to spend
all that time building a boat, dont you want it to last?

The issue is one of using the right adhesive for the application. You
cannot simply condemn PU glue as unsuitable for any use in boat
building, as it works just fine in some applications and it will last,
too. It's up to the builder to determine if the application is
appropriate. Apparently, for your application and construction
method/standards, PU glue was not appropriate. That's not the fault of
the product.

Meindert Sprang wrote:
"Brian Nystrom" wrote in message
news:LT8xe.14504$Q27.5022@trndny02...

wrote:

Joints which were glued with Gorilla Glue and then screwed together (on
the boats) easily came apart by prying, the glue failed. I was
horrified when I saw how weak this stuff is.

If the joints were that weak, the screws must not have clamped them
tight enough and the glue expanded. The same is probably true of your
chair repairs. With tight joints, the wood will fail before the glue
does. You CANNOT use PU glue to fill gaps; it says that right on the
bottle. Epoxy is definitely more forgiving and does fill gaps well, but
you can't blame the PU glue if you use it improperly or in the wrong
application.


But the problem with boats is that you cannot make tight joints most of the
time. It's almost impossible to apply 4kg/cm2 on a joint which is several
meters long.

Fine, then use an adhesive more appropriate to the task.