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Hi Matthieu,
We don't have a carbon/kevlar surfacing prepreg at the moment. To be honest, given the very specialist nature of the surfacing prepreg (it really only works perfectly at 240g for example) then I'm not sure we will ever stock a carbon/kevlar hybrid prepreg surfacing layer.
As for your plan of making your own prepreg, it's sort of possible but no one (apart from one aerospace company on YouTube that a lot of people have seen!) really makes their own prepreg. The reason is that the resins are quite specialist and if you use normal resins you won't get workable gel times and out-life that you need. In emergencies we've done something along these lines but it's nothing like as easy as working with the real stuff.
As for your question about using bagging film as release film, this might be possible but bagging film is considerably thicker than release film and so it's much more likely to cause problems with bridging; release film will work much better and you really do want everything to be going in your favour in order to get perfect results.
Matt
Matt Statham
Easy Composites / Carbon Mods - Technical Sales
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