It should go 10 more anyway. The S2 is the difference. KK's will fade fairly quick but mine went at least 10-12 before the fire went out so to speak. It really only started looking really bad about 4 years ago. About time for another.
I used the old MS Clear which I really liked for these kind of projects,Lot quicker and easier than Universal and the Clear is great shape outside of the Postman Rash on the door. It was 06 but sure wasn't January 1. More like May I think.
Looking good and some Father Son Time well spent.