STUCCO FOR MOULDING.
Take of butter 6 parts, of wax 2 parts, and as much fine flour as when put with these 2 things melted, will make them as firm as wax or modelling clay.
GLUE.
Take mastic, distilled turpentine and white lead.
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.