" It is not necessary to frost any
portion of the cock _C_, except the upper surface. To protect the
portion of the cock not to be frosted, like the edges and the back, we
"stop out" by painting over with shellac dissolved in alcohol, to which
a little lampblack is added. It is not necessary the coating of shellac
should be very thick, but it is important it should be well dried.
HOW TO PREPARE THE SURFACE.
For illustration, let us suppose the back and edges of the cock at Fig.
39 are coated with shellac and it is laid flat on a piece of paper about
a foot square to catch the excess of mastic. Holes should be made in
this paper and also in the board on which the paper rests to receive the
steady pins of the cock. We hold the sieve containing the mastic over
the cock and, gently tapping the box _A_ with a piece of wood like a
medium-sized file handle, shake down a little snowstorm of mastic dust
over the face of the cock _C_.
Exactly how much mastic dust is required to produce a nice frosting is
only to be determined by practice.
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