Dave - I have an e-mail out to Superflite asking them where there
process begins. For example (as you and others point out) some of the
fabric adhesives don't react well with some primers, so the approved
process would have to extend to what primer is used. In many cases,
the owner of the process may also manufacture that primer. Since
their tech guy said Zinc Oxide was fine as a primer for System 1 and
their literature (for system 1) doesn't specify a primer, I feel free
to use anything I want (but to best protect the metal, I'd like to go
with a 2 part epoxy) so I'm left looking for a good/inexpensive epoxy
primer. Interesting - if they don't specify a primer and the process
won't work with some primers, then they have a problem! - MIke


On Mon, 23 Oct 2006 01:36:44 GMT, "David Lamphere"
wrote:

Michael

I'm using the Superflite covering materials (System VI) on the Tailwind I'm
building.

After a lot of research (and phone calls & emails with Superflite) , I found
out that what you use for a primer IS important because if it is not a
really good two part epoxy system, the covering adhesives (and related MEK
solvent) will dissolve the primer!

For example: I was going to use PPG DP48LF (white) epoxy primer on the
sandblasted tube fuse frame. According to Superflite's engineer (and
others) - this will not stand up to the solvents well enough!! But since I
planned to use their urethane color topcoat on the frame before covering, no
problem.. (phew!)

Quite a few of the guys in the Tailwind group have used Randolph Epibond
with good success under Superflite and Polyfiber processes - so I know that
is an acceptable choice for experimentals if you are not trying to match a
certain color.

For certified..... I think you might have to stick with the manufacturer's
process to get the FAA "approved" (STC?) "OK for this airplane" - but that
is a question for the FAA reg experts/DAR's..

Dave

PS.
Back when we lived in upper state Vermont (and the FBO could get reasonable
insurance rates) we rented a T-Craft out of Highgate (FSO). VERY nice
flying airplane.. It was a lot of fun! While the engine was small and hand
started, I thought it was a winner!! Good luck with your project!

"Michael Horowitz" wrote in message
.. .
On Sat, 21 Oct 2006 12:31:00 -0700, Carl Ellis
wrote:

Orval -

I think that Mike is talking about primer for his fuselage frame, not
the fabric. Some covering system require their "brand" of metal primer
for proper adhesion of fabric to frame.


Carl is right on - MIke