Obsessive... Another cause of the wavy navy, can be the result of brush applied gelcoat. I don't know that this is your case on a 4000 body, but too often lazy laminators will brush apply the gelcoat prior to the reinforcement layers. This will result in starts n stops, streaks, thick an thin spots. If you hold the part up to the light you will see what I mean. I've attached a photo I just took of a hood scoop I have here that came from a reputable accessories supplier several years back. You will also notice a few bright speckles from air bubbles. Compound this with the glass reinforcement not able to lay flush with the surface causing a 'wavy' layup and resin pockets... long story short, resin shrinks as the styrene evacuates; thicker unsupported resin will move more than the thinner and squibbly spooge you will have! Brush application.. tolerable for small interior stuff like foot boxes, air scoops trunk trays, etc... but on quality finish surfaces, spray application is the only way to go. Not a solution to your current issue, but I do hope it helps with the understanding for future investments.
Bernica, may I hijack the lovely lady in your avatar?? I promise to have her home by 10
https://www.dropbox.com/s/nkxq67k5b6..._5103.JPG?dl=0
Mike.