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  2. UV damage

Re: UV damage

Richard <mylittlemgb@...>
 

Okay here is my 2 cents worth and many years of painting and composit work. As long as the top coat is opaque color you have UV protection and the glass will not break down. Remember all colors of paint start with white. As far as paint peal this is due to poor prep work before the paint is applied. So as long as the glass has had some king of paint on it, it is protected. The time to worry is when you see blisters in the glass from delamination. We have a fabric covered homebuilt close to me that is flown weekly painted in house latex paint and sits on the flight line tie downs. Covering is now 20+ years old and still passes the punch test. So in short if it has paint on it there is no reason to believe it to be bad.

Richard
FLAPs

--- In Q-LIST@..., Mike Dwyer <q2pilot@...> wrote:


Quickieaircraft... Please post your name and experience signature at the end of each post. It helps us to understand who you are. Thanks.

You said that paints are all the same... Maybe true, but we rely on the dark primer to block the UV, not the top coat paint. The original post said he did not have a UV block primer so the top coat paint is irrelevant.

To Pauls comment, I'd expect the top coat paint to peel off as the fiberglass resin disappears underneath the non UV paint cover.

So, UV primer then white paint to block the ir heat from the sun.

Mike Q200 N3QP 1000hr


Sent from my Windows Phone
________________________________
From: quickieaircraft
Sent: Wednesday, July 13, 2011 9:00 AM
To: Q-LIST@...
Subject: [Q-LIST] Re: UV damage

Probably, Paul, for severe damage, anyway.

My reading seems to indicate that UV protective properties of paint are very close to eachother for different paints, and that the protection really only starts to break down once the paint does.

This is a good thing: if the part wasn't UV damaged during the build and was then painted, then it's probably safe until the paint starts to flake or otherwise deteriorate.

Some UV absorbtion testing in http://www.ultralightnews.com/features/pdf/54NewsletterMarch2003.pdf



--- In Q-LIST@..., "Paul Buckley" <paulbuckley@> wrote:

If the surface is primed and painted, but with no specific UV protection, would not any UV damage beneath the paint be made obvious by the paint surface dimpling and the glass weave showing through?

Paul Buckley
Cheshire
England

TriQ-200 under construction.
90% finished, 90% still to do.....


----- Original Message -----
From: Rick Hole
To: Q-LIST@...
Sent: Wednesday, July 13, 2011 3:53 AM
Subject: [Q-LIST] UV damage



N1711Q is well into that age, built in 1982. When working on damaged areas
we sanding carefully to expose fiberglass in several areas. It looked very
good. That's a single data point, but it falls in line with similar repairs
on Velocities which are constructed with similar technique and materials.

For a plane stored in the sun the answer may be different.

I've seen awful messes for planes which were parked outside without primer,
or thinly primed, and became dumpster bait. I would not consider repairing
any surface in that condition.

Rick Hole

[Non-text portions of this message have been removed]




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