Notices
Questions and Answers If you have general RC questions or answers discuss it here.

Polyurethene glue crumbles?

Old 04-09-2004, 06:55 PM
  #1  
XJet
Banned
Thread Starter
 
Join Date: Mar 2003
Location: Tokoroa, , NEW ZEALAND
Posts: 3,848
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Polyurethene glue crumbles?

I recently spilled a little polyurethe glue (Gorilla brand) on my bench and today, several days after I spilled it, I went to clean it up.

Boy, this stuff just crumbled and turned to powder with only a small amount of pressure being applied!

Epoxy, cyano, aliphatic and even good old PVA all seem to be very hard/strong when cured/dried but this polyurethene glue appears to have no strength at all.

What gives -- is my bottle bad or is this stuff simply not as strong as the other glues we tend tu use?

I sure wouldn't want to use it for any critical joins (which fortunately I haven't) in one of my planes after seeing how easily it crumbles.

Is it best just used for large-area, low-stress joins such as sheeting foam cores?
XJet is offline  
Old 04-09-2004, 08:44 PM
  #2  
Stick Jammer
Senior Member
 
Join Date: Nov 2002
Location: Crete, IL
Posts: 2,251
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Polyurethene glue crumbles?

Don't know about Gorilla but the Probond polyurethane is mighty tough stuff when cured. Definitely doesn't crumble. Sounds like maybe the glue has gone bad or something.
Stick Jammer is offline  
Old 04-10-2004, 07:43 AM
  #3  
aimmaintenance
Senior Member
 
aimmaintenance's Avatar
 
Join Date: Sep 2003
Location: Montpelier, OH
Posts: 693
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Polyurethene glue crumbles?

Your glue may be bad but I doubt it. The situation in which your comparison is based is bad. Without diving into a chemistry seminar I'll just state that the poly glue left to cure in an unrestrained state. (on a benchtop) will expand TOO large and the air bubbles will be so big that surface thickness will be thin, therefore weak. Left to cure in a restrained sate (between 2 pieces of wood) keeps the density high therefore creating a strong bond.
aimmaintenance is offline  
Old 04-11-2004, 04:44 PM
  #4  
phread59
Senior Member
 
Join Date: Jul 2003
Location: coal township, PA
Posts: 1,483
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Polyurethene glue crumbles?

Aim seems right to me. I have used Gorrilla glue on my current plane. Anyplace air gets to it, like when you join 2 sheets it foams up. The joints are very strong. The foaming is normal for this type of glue. I personally would not worry about it.

Mark Shuman
phread59 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.