I just wanted to clarify on the shelf-life of our resins. We recently changed to a different LOT number system and the expiration date can no longer be determined simply by the number on the bottle. The best way to find out the date would be to provide the numbers to email@example.com. It is unlikely that Formlabs would send out new resin with only 4 months of shelf life left as these should not be available at our facility. If this is the case, the support team would be happy to help rectify the situation!
I am sorry to hear that your resin does expires so soon; this is certainly an unusual experience. Could you open a support ticket with our team here with your most recent order number for the resin and a brief explanation? They will help you get sorted out!