I use “L” shaped pieces of sprue to get to the bottom and stir it up. Hasn’t made any difference.
I‘ve spent the last two hours reading about the problem and Mig’s solutions. Use his primer and apply it in multiple, very light coats. Then thin the finish paint with a drop or two of a cellulose thinner like Mr Color Mr Thinner. This along with the primer will help break surface tension and aid in adhesion.
I think I’ll just go back to Tamiya and Polly Scale.