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I only encountered this porousity, if the PETG was not stored in low huminity before printing. I use big color indicator silica gel bags in paint buckets for storage of filaments.
Another approach would be thin coating the PETG vat with resin with a brush and uv curing it before applying the FEP foil. Should result in a water tight PETG vat.
Of course, PLA can be coated as well. ;)