So finally I broke out the big gun! First coat of base color went on. I again had some minor dry-spray issues due to my inexperience, and I also encountered some unexpected texture with the sealer coat, leading me to decide on another base coat spray session:
I had a sag on one of my GT sideskirts, dag nabit! I knew I needed to address this before recoating. I don't seem to have any photos of this step, but the sag was carefully sanded flat with a block and 800 grit IIRC: