Etex is a wonderful clearcoat and superior to D2ton in my opinion.
If you are measuring with syringes, stirring throroughly including the bottom and edges for a few minutes, and then applying, you should have no problems whatsoever.
I'm curious, is the unused portion in the dixie cup fully cured? If not in then it must be a bad batch. If so, then it is likely a result of something with the wood, the sealer, paint, etc.
I have done a ton of lures with etex and have yet to have the problem you are describing. If the problems continue, get another batch.
Jed V.