I decided their were some real obvious low spots that would be easy to fill and sand now instead of after primer so I spot filled with Z Grip wherever I could find them, contoured them down and Skimmed the canard with the # 2 coat. After skimming I was able to find a couple I missed but those will easily be filled on the next round. PLUS it's a lot better to have all the z-grip under the skim coat before primer.