Glaire

When glairing in grained leathers such as Morocco a froth has a tendency to form; this can be dissipated by adding a spot or two of milk to an eggcup full of glaire.

Source: wiktionary

Unlike traditional egg glaires these are impervious to insect attack, and can be tooled long after application. BS glaire also keeps indefinitely, unlike egg glaire.

Source: wiktionary

You’ll also need glaire for gilding the edges, such as egg glaire or food-grade gelatin.

Source: wiktionary