I would guess that there was more tot hat than product failure. Probably top coated the dp too quickly or possibly a inaccurate mix with 401 or 402. There is an induction time with 401. Dp epoxy never gets hard. It is somewhat soft by nature and that is why it is labeled a non sanding primer.
So, is week of dry time too soon? I mixed it properly, it was dry when I coated it. Check with Evercoat. Featherfill G2 Gray Gallon Please read the details section.