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It can sometimes happen that a leak occurs after the part has infused, even where vacuum was securely held prior to and during infusion. Sometimes the effect of resin running through the part can loosen some part of the perimeter tape and it can become more prone to happening where the bag is quite tightly held
Looking at your picture, it does look like your pleats were quite small and, perhaps, there was some excessive strain around these areas, even though the part looks quite small
I'd recommend using slightly bigger pleats and trying to position the bag so that there's the minimum of strain on them whilst pulling down the vacuum. A bag with plenty of slack will produce less strain on the perimeter tape and it's also worth going around the entire perimeter and pressing things down firmly juts prior to infusion, even if it appears that full vacuum is achieved, just for added certainty
Make sure also that you wipe the areas where the tape is placed to make sure that there's not a build-up of release agent there that might make the tape a bit less sticky when applied. Observe the part for a few minutes after infusion and try to press the tape down quickly if you notice any 'creep' of air occurring, which might help stop the whole part being compromised
Careful prep of the bag should, hopefully, limit the occurrence of such issues, but it can sometimes happen quite inexplicably. On a flat-ish mould, with very clean flange areas, it should be quite rare, though
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