a lot of people assemble and then prime, some people prime on sprue, you should be washing all of your models with at least soap and water and an old tooth brush (I use "Green Stuff") and then rinsing them, that way you get rid of the mold release left behind by the casting process, this should be true with any cast pieces, Metal, Plastic or Resin. Obviously this takes a little bit more time as you have to wait for the models to dry, but easily something you could do the night before. This could be your issue, but I am not sure as I have never run into it specifically before.
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