Originally Posted by
acdii
Thats all fine and dandy to not use cloth, glass, or silkspan, however, if you just coat one side of the wood, the interior is still exposed to moisture and lack of it and will still cause the wood to shrink or swell, so all your work on the outside could be ruined if you dont apply a sealer to the inside of everything.
What you say .... coat the interior is true BUT I must have thirty or so planes, none are coated internally except the tank and engine bay and several are over twenty years old with no ill effect!