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I can't see how curing in an autoclave is going to be any more reliable than OOA. You still need to get the layup right with good technique, you still need to follow the cure schedule of the material, you still need to make sure the autoclave temperatures are even and that your mould is heating up evenly etc.
Realistically, when you have an OOA system that is designed to work without the pressure, then simply adding pressure isn't going to make it work any more reliably - it's a case of working out why what you've got isn't working every time. Whether it's an inconsistency in your oven or your cure schedule, or possibly more importantly whether your technique needs improvement - there's something going on that is causing the problems, and changing to autoclave isn't necessarily going to fix that, it's just going to add complications and huge expense.
Has I mentioned to you in our PM conversations, I'm yet to have great success with the XT135. I don't find it a very forgiving material to use, and the need for it to be absolutely perfect straight off the pattern means that it can be a very frustrating and expensive material to use. I'm still working on that though, as what I've been trying it on has been both non-recommended pattern materials, as well as some quite complex layups that really examine my layup technique.
That said, the XC110 has been extremely reliable for me when used in a wet-lay high temperature epoxy mould. It's perfect results every time, no pinholes at all. Very very easy to use, very reliable, very consistent results. So I think your consideration shouldn't be whether you change to autoclave or resin infusion, but rather whether you persist with the XT135 and work out where it's going wrong, or if you start off with making some hand laminated high temperature epoxy tools and get the XC110 working the way you want it to.
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