The second receipt of Rosselli for fifteen ducats was made out on May 24, to Francesco Granacci, so he was already in Rome, helping his friend.

The next payment of ten ducats was also made by Granacci on June 3, and another on June 10.

On July 17 Michael Angelo himself paid the mason; so Granacci had gone to Florence by then to hire the other assistants.

On July 27 Michael Angelo paid Rosselli thirty golden ducats, full weight, for rough plastering and other details.
The amount paid, and the time taken, go to prove that the whole vault was plastered.

Granacci( 106) wrote from Florence about the assistants.