Flash depends on local factors, you either leave plenty of time or press your fingertip into painted masking to assess it.I’m not too sure but I think the question being asked is the flash off when putting his two or three coats on. I had a quick look and the flash off doesn’t seem easily available but I’ve never used the stuff.
That’s what I was looking for, much appreciatedOvercoat any time after it has flashed, but 18 hours before flatting.