Quantcast

Spraying poly urethane on Spruce wing ribs

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

wsimpso1

Super Moderator
Staff member
Log Member
Joined
Oct 18, 2003
Messages
7,244
Location
Saline Michigan
I wouldn't. Modern way is ribs and spars and all reinforcement blocking is bonded with West or T88 epoxy, then the complete ashy is garnished with same epoxy. Then its is bonded and sealed. If you spray PU on the ribs, you interfere with bonding between parts.

Billski
 

akwrencher

Well-Known Member
HBA Supporter
Joined
Oct 16, 2012
Messages
1,292
Location
Gustavus, AK
Some people still use varnish other than epoxy on small wood wings, but as was stated, you don't want to risk poor glue joints on the rest of the assembly. Some people mask the areas that will need glue, some sand, etc. Sounds like a lot of work to me, but each person, situation, is unique. Personally, if I get to building my wood airplane, I will probably use epoxy for all of it. I've been told West Systems special coatings hardener is good for that, but do your own research. My memory isn't especially awesome.
 

Rockiedog2

Well-Known Member
Joined
Dec 11, 2012
Messages
2,378
what TFF and Bill said. PF EV 400 epoxy is good and none of the other coatings/glues that I know of will attack it. If gluing the fabric probably best to lightly sand the tops of the capstrips
 

Dominic Eller

Active Member
HBA Supporter
Joined
May 16, 2019
Messages
43
I used Norski epoxy wood treatment. Goes on beautifully and penetrates very well. It was suggested by some folks I know who do Beech stagger wing restorations.
5887FD16-B55D-461E-83A5-226FCACA7B8D.jpeg820431A8-D72C-4A17-9DBE-BDEAF5F77F88.jpeg25C893B2-2F28-4C63-AB9B-FDBF0A237489.jpeg
 
Top