Testors Dullcote and Glosscote Lacquer clear coats are HORRIBLE when it comes to yellowing.
Possibly the worst. They have a unique (strange) solvent package that no other "lacquer" uses.
Heavy on Ethyl Acetate.
Over dark colors they are fine, over light colors, really LOUSY.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !