"Crust leather" is the term used to describe tanned and finished colored leathers, which are then carefully refined through a drying and smoothing process. This "Crust" already exhibits all of the necessary physical attributes for its subsequent use. The last property still required is a uniform surface with a protective function.

In the finishing process and to bond the different materials, dyes are applied through spraying or coating methods. Thermal curing and hot ironing operations produce a consistent, eye pleasing appearance and an elegant touch.

A finisher must have trained eyes for color and bring some imagination and appreciation for the beauty of the finished product, which cannot be described in words, but must be seen and felt.