Will polyurethane glues cure in a vacum?  
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Will polyurethane glues cure in a vacum? - 4/5/2002 9:16:07 AM   
RossiRay


 

Posts: 138
Joined: 1/2/2002
From: Spring Valley, CA, USA
Status: offline 		I will be sheeting my first set of wings with vacum this weekend. I have used polyurethane glues for this in the past with great success. Will these adhesives cure in a vacum?

Ray
       Post #: 1

Will polyurethane glues cure in a vacum? - 4/8/2002 11:17:26 PM   
747drvr



Posts: 1242
Joined: 1/25/2002
From: Dundas, ON, CANADA
Status: offline 		Yes they will but of course they won't foam up like under ambient conditions. I'm no expert, but I think it's water that starts a chemical cure as opposed to air drying. Not just blowing my horn, I vacuum bagged some skins to test out my theory and it worked out great.

_____________________________

Marc Thomson
Dundas, Ontario, Canada

(in reply to RossiRay)
       Post #: 2

Will polyurethane glues cure in a vacum? - 4/9/2002 2:16:51 AM   
majortom-RCU


 

Posts: 1583
Joined: 12/11/2001
From: Merrimack, NH, USA
Status: online 		Normal atmospheric humidity is enough to cure polyu glue. If you happen to have a low humidity shop or live in a dry climate, a very little moisture added to your balsa or whatever will help the cure. Just wipe the balsa lightly with a damp (not wet) sponge is enough. When I'm building in the winter (dry indoors) I usually just huff some warm breath on the balsa, and the moisture from your breath is all it takes.

(in reply to RossiRay)
       Post #: 3

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