UV and Epoxy?

Our EAA chapter has received a donation of a Pulsar "Quick Build" kit
that has languished in a hangar for several years.

Looking at the materials, it is apparent that some of it has been
exposed to sunlight coming through windows. The exposure is enough to
discolor those areas that were not shielded.

The fuselage shell and skins on the wings and tail show this
discoloration, which changes the parts from white to yellowish tan.

I do know that epoxy does suffer degradation from UV exposure.

My questions:

How much structural degradation (if any) has occurred?
Does it affect future safety of flight?

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Orval Fairbairn schreef:
Our EAA chapter has received a donation of a Pulsar "Quick Build" kit
that has languished in a hangar for several years.

Looking at the materials, it is apparent that some of it has been
exposed to sunlight coming through windows. The exposure is enough to
discolor those areas that were not shielded.

The fuselage shell and skins on the wings and tail show this
discoloration, which changes the parts from white to yellowish tan.

I do know that epoxy does suffer degradation from UV exposure.

My questions:

How much structural degradation (if any) has occurred?
Does it affect future safety of flight?


If the windows were glass, no problem: glass filters UV very effectively.