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I have recently been working a lot with Oramask and have done a write up explaining my process.
I would most likely guess that the cause of this is leaving the Oramask on too long. I have noticed that on plywood, when left on too long, the Oramask will peel up chunks of the veneer.It is some pretty strong stuff. Another issue could be with how long the spray paint was left on top of the Oramask. I try to just let it dry enough so it doesn’t run. The sooner you get it of the better in my opinion.