Massimo,
Timesaver compounds will not charge a lap, and their abrasives break down quickly and quickly stop cutting just as their website indicates. They are primarily made for smoothing bearings and mechanisms. Because Timesaver compounds do not embed, their yellow compounds can be used on soft bearings. If you have to lap a bored cylinder (hard metal), Clover silicone carbide embedding abrasives will do the job much faster.
Jeff