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Your Porsche touch-up paint should have been a two-bottle kit, one the Seal Gray and a bottle of clear-coat. Why didn't you use the Porsche clear-coat?
I think your problem may be the old Duplicolor clear coat you used. Clear coat is funny and fussy stuff. It may have been too old to be any good anymore. Or the ambient humidity may have badly affected it.
I am currently trying to paint some Seal Gray parts using the Dr Colorchip paint airbrushed, and Express Paint urethane clear coat, and...the first clear-coat was fine, but the second was done with too much humidity, and it wrinkled up on me. Ugh. Gotta now sand-down and start over again.
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