Exhaust hoses are softer on the xp than whats on my 97 GSX also. Wetsanding sucks but produces great results. This is my GSX resto from 2 winters back. It was a dullish yellow from the sun in many areas, but 10+ hours wet sanding and buffing it still shines like brand new today. Same for a 98 speedster i did the winter prior to the gsx.
I've gotten to the point where ill pay a premium for a non running ski in good cosmetic condition as id rather rebuild an engine than wetsand and buff! Plus you can't really ever trust a running 20+ year old ski anyways.
Aren't all the engine hatch covers on those boats plastic? You're saying you could wetsand and compound plastic and have it turn out like that? Wow.