> >Joel Ventura wrote:

 > >
 > > On one of the mail lists I subscribe to (I think it was
 > canard-aviatiors) there have
 > > been warnings to not use powder coating on engine mounts.  The coating
 > adheres poorly to
 > > the substrate, and cracks in the tubing with not show up in the coating
 > surface.  In
 > > fact some coating companies advertise powder coating as a way to cover
 > up cracks.  White
 > > paint is a much safer alternative.--Joel

Mike Wills wrote:

   Ive also been told that powder coat is not a good moisture barrier. Vans
 is currnetly supplying some of the 4130 weldments in the RV kits already
 powdercoated. Ive heard of several cases where these parts were rusting
 under the powdercoat right out of the shipping box. Powdercoat is a good
 durable ornamental covering but I agree with Joel, paint the motor mount.

 > Mike Wills

Hi all:

        I have yet to find a better paint than 2-part epoxy over bare
bead-blasted metal, cleaned w/ MEK before painting. Every time I prime,
I have failures - in fact Gulfstream's beloved green primer ( w/ no topcoat )
allows me to practice my corrision removal skills w/ a grinder
constantly. Under
a unbroken primer film, the metal worms will be merrily munching.
Yes, these are
20-30 year old airframes, but I don't want to do extra work later,
just fly. YMMV.

Regards,
James

 
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