Paint breathing ???

Hello, I spoke some time ago with a conditioner who explained to me that he prepared the varnish before sealing as follows: He used a (means !?) that opens the pores of the varnish, cleans it and smoothes it, and then the sealing (Diamondbrite) is applied. He didn’t guess what means it is, I forgot to catch up in the further conversation. However, my subsequent research did not enlighten me. ME can probably only be a precleaner. However, that the pores of the varnish are opened and he breathes is probably nonsense or ? Maybe a care professional can help me.