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Don:
Not having built my airplane or any other composite
airplane, I'm certainly no expert. However, being an avid reader of and
learner from every piece of literature I can find on building our airplanes, I
can at least quote some experts. The sainted Tony Bingelis and several
others say that the reason we see "print-through" of the fabric after painting
is the resin continues to shrink for a long time (i.e. months) after
lay-up. So if your composite structure is relatively "green" when you
paint it, you're going to get some print-through. My airplane was painted
a year after it first flew in primer, and I have several spots of
print-through. I'm planning to re-paint my plane this summer, so I'd love
to hear from others what they've done to prevent fabric print-through on
"mature" paint jobs.
Lee "Q-Tip" Metcalfe
N320WH - FB#449 - 472 hrs - Kansas City
(IXD)
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