I just picked up a new to me H16. The rudders need some love. Does anybody provide a service where you can send them and have the chips repaired and re shot with gel or epoxy?
If the rudders are fiberglass any marine or body shop that does fiberglass work should be able to resurface them.
Your title says "White Hobie EPO blades" The only white EPO's i know of are the fairly new design EPO2 and EPO3's. Is that what you have? If they are older white rudders they could be fiberglass "racing rudders" which can still be repaired or plastic (ABS, Lexan, PCG, Nylon) which aren't as repairable.
If you aren't sure what you have, what year is the boat? Might give a clue.