https://www.compositesworld.com/articles/double-bag-infusion-70-fiber-volume

There's got to be something there besides just safety and redundancy - but I'm not sure what it is.  It keeps coming back around too much for something completely bogus!  I know it is possible to push resin back out of an infusion with an autoclave so it might be doable to use a second bag and a differential vacuum... the intensifiers without wrinkle-risk seem interesting too.

I've never tried double bag with infusion - only ever double bagged pre-preg cook bags for $$ stuff - and then the best part was how well it pushed down the inner line of sealant tape!  Totally buy the process reliability thing for high stakes parts.

Has anybody here actually tried the method described in the article?