On Sat, 18 Aug 2007 06:32:14 -0400, Michael Horowitz
wrote:

Elsewhere I"m listening to a discussion about using boiled linseed
oil/Tubeseal to protect against rust on the inside of the fuselage.
There appear to be two views: one is start pouring the oil in thru a
small hole until full, then seal the hole. The second view is fill her
up, slosh around to coat, drain and leave the hole open.

Is there an authoratative source for which approach to take?

In either case (unless the fuselage was specifically built to be a
seaplane), tubing isn't interconnected (correct me if I'm wrong), so
if you you drill a hole in the lower left longeron and pour in oil,
all that will be treated is the lower left longeon - not the tailpost,
not cross tubing. Correct?

- Mike

no. it is recommended aircraft practise for a hole to be drilled
between the tubes in the centre of the area the joining tube will sit
over. that's if they followed standard practise. so you can pour in
one end and rotate the fuselage all about and the fluid will
eventually migrate through the entire fuselage.

the two fluids work differently. linseed is heated before use to thin
it out and so that you can feel how far it has reached. it needs to be
sealed off since the setting to a varnish absorbs oxygen and leaves
the interior air in the tube oxygen depleted. once it sets off it
stays in place.

tubeseal has components in it that wick out over the surface of the
metal. I tubesealed my fuselage six months ago and it still seems to
be fluid.

another method I've found to still be working after 50 years is to
swab the tubes out with lanoline (wool grease) the auster fuselages
have this and in my cutting out of a corroded part on the rudder I
discovered that the corrosion had not spread from the area that was
damaged.

I went with tubeseal when I redid the fuselage.

Stealth Pilot