I don't use shellac, I use IBD and always lightly buff as part of prep. I even do it with manicures but then buff with a buffer and oil afterwards. Which I know will make you all recoil with horror.
You can see my other hand but 2 things- 1. I didn't do this hand so it's not up to my standard. 2. I had bitten the nails on this hand prior to having the smart polish on.
It is my understanding from your previous post that the prep for SmartPolish includes buffing of the nail, I just said that I get better lasting results from Shellac without any buffing. Unless we are not discussing pros and cons of SmartPolish anymore, then I apologize for the misunderstanding