I read published specs for bagging film indicating 300% to 450% elongation. When I study the tutorial videos on resin infusion, I see everyone using pleats. Is it really necessary to add pleats when the film will very likely stretch as much or more than the depth of the female cavity in the mold (mould)?   I can easily imagine that a car bonnet would not require any more than 150% elongation. Could that be done without pleats?


A Lifelong Learner

And the bag may be to stiff to conform to details like design line edges. Or the edges around the mould flange.
And the bag pulls at the tacky tape, wich isn't good at all.
Don't do it unless it's a flat plate. Even there you should leave a little extra film for the connectors.

Thank you oekmont. Have you seen any videos that teach the best techniques for pleating? At this time, I have been unable to find any videos that teach the best practices for pleating.


A Lifelong Learner