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Wooden Box spar sealing?

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Joined
Feb 28, 2010
Messages
23
Location
Guyton, Ga
Hi everyone, I'm working on a wooden wing that uses an open box rear spar (1/2 X 1/2 spruce caps with 1/16 ply face). I'd like to put a ply skin on the front side to make it a full box spar. Do I need to varnish the inside before closing it up? thanks. James T
 
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