Powder Coat on 4130

On Sat, 24 Mar 2007 18:09:01 -0400, "J.Kahn"
wrote:

Drew Dalgleish wrote:


I find it very hard to believe that forces strong enough to crack 4130
wouldn't be strong enough to crack powder coating.
I suspect the real reason for not powdercoating the chopper frame has
a lot to do with filming schedules.

Drew, I believe it is related to the fact that the film is somewhat
flexible and tough so that it can accommodate a small subsurface change.
It's a bit like polyurethane paint's ability to hide filiform
corrosion, which really hurt Cessna owners back in the 80s when their
late 70s 172s started showing filliform corrosion under the paint
because Cessna used washer primer instead of epoxy primer when they
first went to urethane paints.

John

Thanks John I thought powder coat was more like ceramic and
inflexible.