Nissan's are known to have very soft and thin clear coats. The GT-R actually has a badge that states this paint is extremely hard...that that is the exception. Compared to Chevy (which uses an above average hard clear), it's crazy! I have a Cobalt before my Z and my Dad owns a C6 Vette. The Vette has a clear that is super hard. That's why you're seeing so much of a difference with your Z as compared to your Vette. The problem with hard clears is that they are a pain to correct sometimes.
Don't get a clear bra...it will turn yellow overtime and anything that is big enough to damage the bra will just go through and embed itself into the paint. Find a good detailer that knows what they're doing with a rotary and have them maintain it. A good sealant will last you a good 5 weeks or so depending on the elements and will protect against the bird bombs, water etching, etc.
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