Polyurethane Glues ?

Hello:
Seem to be seeing more and more ads these days for "Polyurethane Glues."
They claim that they are as strong as epoxies, but with the big advantage of being only a single component.
a. Are they truely as strong as the typical two part epoxies like the Devcon products in the double-syringe packaging you see in all the hardwarfe stores ?
b. Pros and cons of polyurethane adhesives ?
c. BTW: Is this what that Gorilla brand of glue is ?
Thanks, Bob
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They bond close-fit surfaces as strongly as epoxy but epoxy has some other advantages like faster curing, can cure in thick layers, does not expand.
Polyeurathane glues need some moisture in the bonded material and are generally more flexible than epoxy when hardened. This may bond better to some hard to stick plastics since epoxy often is too hard and brittle and flakes off these materials.
Epoxies are available in a wide range of colors, curing times, hardnesses and other mechanical properties.
Not better but different, choose your application wisely. Stuff is excellent for bonding wood with a waterproof agent. but will not fill a large void.
Don't waste your $ on Gorilla, buy a larger bottle of Elmers (brand) for less $. It's almost exactly the same.

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Robert11 writes:

Claims without concrete specifications of material properties are vacuous.
What are the respective properties, such as pull-off psi?
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Robert11 wrote:

Read here... http://www.popularwoodworking.com/features/fea.asp?id 64
-- dadiOH ____________________________
dadiOH's dandies v3.06... ...a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico
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