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Hi Philip,
P3 film won't allow enough resin down into the laminate. It will, as you've guessed, mean that resin will stay on top of the film and race through the peel ply and mesh to the vacuum line without wetting out the laminate before it gets there. Warren wasn't sure how well the relase film would come away from the resin - although it's academic in this particular situation the answer is that it release completely and utterly perfectly. Release film simply will not stick to resin in any way, it literally falls away. Worth remembering for lots of other situations where release film can be very handy stuff.
Warren's right about breadwrap, it does allow resin to pass through much more easily but there are a few issues with this. When we use breadwrap in an infusion (which isn't that often) we use it as a barrier between the infusion mesh and the peel ply (which is against the laminate). By doing this, it makes separating the the mesh from the peel ply much easier which in turn makes separating the peel ply from the part easier.
The bottom line is that resin infusion, done in the normal way, doesn't lend itself to creating a 'double a-side'. Depending on the part that you're trying to make, and your determination to have a part that has a double a-side when it comes out of the mould, you could create a matched-tool (a male and female mould that come together, a bit like RTM) and then use an internal flow media (like Soric but others are available) so that you don't need to use a peel-ply and mesh at all. In this way, you could certainly have a double a-side part with no trace of peel-ply.
I hpe this helps.
Matt
Matt Statham Easy Composites / Carbon Mods - Technical Sales
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