I called up Jeffco Epoxy and talked to one of their guys about their 1307
resin system.  He said that their resin had a HDT (Heat Distortion
Temperature) of 190 degrees F.  He also said they had just done a study of
paint color on wind turbine blades and that even ones painted dark colors
only got to 165 degrees.  I asked Lancair what the HDT of their prepreg
system was but they couldn't tell me.  I'm still researching but the oven
cure time is an indicator of what the final MIGHT be.  Since they cure at 260
degrees F, their resin system could very likely be in that range but it isn't
a certainty at all.

As for me, I'd rather have a higher HDT resin system.  

Dan