I'm planning on infusing some sandwich panels that will be 1 outer skin of 200gsm carbon 5mm perforated PVC core and 1 inner skin of 200gsm carbon. Will it negatively influence my infusion if I only put peelply on the inner skin (bag side) where I plan on doing secondary bonding? The whole thing would have a layer of P3 film and flow medium on top of it.

No, only worried about the mold side being nice. I'm planning on doing the sandwich in one shot. Stack would be:

mold
200gsm carbon
5mm PVC core
200gsm carbon
peel ply in places that need secondary bonding
P3 release film
flow media
bag film


The bag side will have some areas where things will be bonded to it. I'm wondering if I only put peel ply in the areas that need it if it will negatively affect my infusion by changing the flow rates in those areas.

Sorry, I miss read what you intended I read it as though you were going to premake the inner and out skin and bond to the core after.