The second layer added a little more sparkle, not much, but enough to see in the setting sun of evening under a sunny blue sky. But then again, it might have been autosuggestion from thread research), as this is my first experience with SG. AIO I've used before.
My polishing marathon over Turkey Day weekend was revealed to be inadequate this morning in my office's parking structure high intensity lights. I missed some scratches on my hard tonneau, so it looks like I will need to breakout the "grinder" to take 'em down. I have included this merely to point out the SG doesn't fill or hide swirl marks or small scratches - I guess that is because you apply it thin-as-a-cobweb.