Refinish gone yellow?

On Monday, January 5, 2015 2:16:45 PM UTC-5, wrote:
I recently looked at a glider that had been refinished by Dave Nelson in 2001/2002. It has been in it's trailer, and hangar for the last 2 years and not flown. It is located in Texas. In the dim hangar lights, the finish seemed a very faint yellow. Could of been all the dust... It was glass smooth, with no cracks or crazing, but when I used a flashlight, in the dim light, it "seemed" slightly yellow. I live in AZ, and have been told that once I moved it to a hot dry climate, it would "perk" up and whiten up.. Any further thoughts on this?

Thanks

As mentioned, it may come up with a good polish, I've seen "brownish" finishes come up nicely with a good machine polish.
If it's not crazed, it's likely fine. Remember, "the air doesn't see the finish color......"

Incandescent lights tend to cast a yellowish light, seeing it in sunlight will show any real flaws, or show better finishes.

I understand that the catalyst for Schwabbellack contained styrene and
that if a finish or repair was not thoroughly post-cured, then the
slightly lower crosslinking density allowed the styrene to migrate to the
surface over time...and styrene is yellow.
Post-curing through localized external heating or cycling the whole
structure to progressively higher temperatures increases the cross-
linking density. (Done properly on a major repair or new-build, this
can substantially eliminate polyester gel shrinkage over time and
largely avoid the need for refinishing. Provided it's not finished in T35
which is not UV-tolerant.)
With Schwabbellack the post-curing 'locked' the styrene and prevented
discoloration.
A chemist would be able to explain better and more authoritatively. Or
Wikipedia !
It's cosmetic only though. I had a new-build LS6 (one of the very last
from Schneider) that had yellow patches where lots of gel had been
used. Went like a dream.
Akso-Noble stopped producing Schwabbellack some years ago but
other polyester finishes are likely to have the same chemicals.
It can be really difficult to see how discolored a finish is - need
daylight but not sunlight and a reference colored surface.