Do you think LP needs break-in to sound its best?

Mold release is applied to album stampers to prevent the vinyl from sticking to the stamper. Some of the mold release will be transferred to the new album; therefore, new albums should be cleaned prior to play. What you are hearing is the phono cartridge needle cleaning the mold release from the grooves of the album after each subsequent play.

Gaslover, please google vinyl record mold release and you will get numerous hits that discuss this topic with more authority. From my understanding, the mold release agent is a stearate compound which is mixed with the vinyl before pressing. Stearate compound cools at a slower rate than vinyl, therefore, it acts as a lubricant allowing the vinyl to be released from the stamper.