I don't know what it is that lays on the surface of flourescent paints but I have had the same problem. The epoxy will "fish eye" on flourescents.
Give them a light scratch coat of clear and hit that with your epoxy once it dries well.
I rattle can all my plugs as well and I can have a 20 plug run going with only a couple flourescent colors in the mix. I get the fish eye problem on only the flourescents!!
Good luck with them.
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