It is forty thin applications, not four thick ones
The rubber
Wadding inside a cotton cloth, charged until damp rather than wet. If it leaves a wet trail, it is far too loaded.
The passes
Continuous figure-of-eight motion, never stopping on the surface. Stopping leaves a mark that has to be polished out again.
The timescale
Three or four sessions over as many days, with the surface left to harden between. Attempting it in one afternoon does not work.
