I just recently bought a donzi zr 35. I am looking to do some gel coat touch-ups. I called Donzi and they told me to call big thunder marine. No one has returned my call. is there a way to look up the hull number and find out the details.

Honestly, gel starts to fade/change color from day 1... You're better off trying to color match yourself or take it to someone who can do it.. You might be very disappointed if you get a "factory" gel coat to find its not a match

You can try these guys.

Gel Coat – spectrumcolor.com

Donzis gel is a pretty standard white and ive had pretty good luck with HK's standard pff the shelf production white. The paint code match is PPG 91050