I haven't tried it but plan too and feel it's worth a try.
I can say that when I detailed my Mother in laws 10 year old car, the dash was pretty whipped - sun fade bad. 303 made it look brand new. I'd follow the process they recommend in the link to their website you included and make a judgment - seems MUCH easier than rotary compounding.
I think I'll have a go at maintaining my fiberglass boat with 303!
