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.

Hi,