I've never heard of this, but usually you just spray your base as smooth as you can then nib it out then spray more base in that area. Then proceed to clear. Your color sanding your clear, and I go 1500, 2000, then 3000. Works great for me. On black I have sanded black before the last coat with 1200 just to get a cleaner job, you still have to put more base on before clear. Hope this helps.