I've been building my first plug for the air conditioning housing on my Marcos Mantula. While I'm quite happy with the way it has turned out in general I am finding the application of the pattern coat primer to be more difficult than shown in the Easy Composites video. I've tried using a brush and a roller, but can't seem to get to the stage where it only needs minor sanding. There always seems to be new imperfections with each coat.

Have you tried spraying the coatings through a regular HVLP gun? I have sprayed tooling gelcoat with a 2.5mm tip on a HVLP gun and that worked very well, so I would think that these coatings would work too. Easier than the G100 for smaller parts.