I guess petroleum products and glassfibre/composites really don't mix well after curing!
TT - These problems can be easily overcome if they are forseen -
take a look at this FRP ship - with diesel in it's FRP tanks.
Sure no one expects a propeller to be immersed in a hyrdocardon product as they do with a bulk fuel tank, but as a propeller blade is situated right next to a fuel tank and an engine....it could be argued that this contamination should have been forseen.