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I have not had any problems with Crystal clear - yellowing or otherwise, but I also keep my finished models in display cases out of direct sunlight. UV exposure is the main cause of yellowing.
Some guys swear by PlastiKote clear, but it always wrinkles my paint. I've tried it a couple of times, always over PlastiKote paint, with the same results. Besides, take a look at the bottled PlastiKote clear, it yellows in the bottle, so it'll probably yellow on your model.
I prefer the Krylon. Tamiya clear is good stuff too, just don't apply it over Testors enamel! The Krylon has worked well for me over every paint I've used - Testors, PlastiKote, Odds n Ends, Short Cuts, Tamiya, Diplicolor, Zynolite, Plastikote engine enamel, Zynolite engine enamel and Duplicolor engine enamel - no problems yet!
HTH,
Tim D.
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