I'm about to test some parts made from prepreg material and I'd like to produce our own prepreg similar to the method in David Algie's now famous video. If I understand correctly, I can obtain a b-stage cure with our existing array of epoxies and vinyl ester resins simply by changing the catalyst??? Can anyone using this method of DIY prepreg production recommend a good epoxy and catalyst to use?  

Thanks for the reply! We are more concerned with high strength and heat durability. Our stuff is designed to be dragged through the gravel at high speeds. We'll have to determine if the pin holing in OOA will be acceptable. That's partially what this test is for. 

No sorry... No suggestions. I know your stuff is more about durability. But I think the pinhole issues are more of a finishing issue if you lacquer and want to supply a really nice finish to your products. My original fairings and monocoques looked awful as soon as they were lacquered so the customer could have the finish they wanted. Now I use the SHD material exclusively and it works even at the low oven temperatures I run. I have found I can easily cure with a 2kw heater element which is very low power for an oven the size of mine. I think if I improved it more with better insulation from what I have learned over the past 12 months I may even be able to run 1kw! lol..

I think finding a good off the shelf supplier with materials like Diolen would be good for you and your products. I prefer diolen over Kevlar to be honest.. It self heals up to a point and does not slough the fine strands when abraded. 

Maybe think in terms of a finish that will assist any durability issues (on the outside at least), a marine polyurethane clear coat (durpox or similar) will aid with scratch resistance. The rest of it is down the resin and layup