I was dusting my built models recently, and was surprised to see that the decals on my 1/144 Hasegawa 747-400 (JAL Super Resort Express) had a turned a light brown color. Not just on a portion, the entire clear part of the decal I neglected to cut when applying it had also turned brown
. Looking over at my 1/72 Testors OA-4M Skyhawk, I saw that it too was devoloping this brown stuff.
Is this ?normal? (sun exposure) or am I screwing up somewhere?