This whole experience has taught us both a lot. First of all it shows that the BJD community is a friendly and supportive group ready to help when one encounters a problem - even when the doll company is not. It's also a very important discovery that flaws in the resin will show up when a light is inserted into the doll. If everyone ordering a blank doll takes a few minutes to check their dolls upon arrival - and take photos to document any problems - it will save a lot of heartache when they try talk to the doll company and they try turn it around and blame the customer. Several people told me they had light spots develop on their darker dolls during the faceup process, but they thought it was just their inexperience, or a problem with the sealer. A simple "candling" before starting would have shown any flaws if there were any, and if there were none, then yes, light spots appearing during the faceup, would most likely be from the sealer.
Another thing I learned in my research into what could be wrong with Peach, was that the most commonly used mold release for pouring resin, contains teflon. I have no way of knowing what's in the mold release the various companies use, but they definitely have strong "anti-stick" properties. So it's always very important to throughly clean a blank doll with Magic Eraser, soap and water, to remove any mold release residue. My IH Asa JID was the only doll I purchased with a factory faceup, and part of her lip paint just flaked off within the first year. My EID Carina was the first IH doll I ordered blank, and at the time we weren't aware of how paint could flake off a doll which was not thoroughly cleaned. So Carina's fingernails and some of her body blush started flaking off within days. After being stripped and thoroughly cleaned with Magic Eraser, her new faceup and body blush had no issues at all. Working with BJDs is an on-going learning process, but I wish sometimes it would be a little easier. Hopefully my next doll will be perfect!