In fact, this class of work
does not bring into play so much muscle as to warrant complaints on
account of it. Nor can there be any reasonable excuse for taking a
longer time to spread a stiff filler than a thin filler.
Good results are not always obtained by the use of thick fillers,
because the putty is spread too soon after the application of the first
coat of oil, which liquid should be quite thin, and reduced either with
benzine or turpentine, so that when the putty is forced into the pores
the oil already in them will have the effect of thinning it. As an
illustration of the idea meant here to be conveyed, we will suppose a
quantity of thick mud or peat dumped into a cavity containing water, and
a similar quantity of the same material dumped into another cavity
having no water; the one fills the bottom of the cavity solid, while the
other becomes partly liquid at the bottom, and must of necessity shrink
before it assumes the solidity of the former. Hence it appears that work
to be filled should be oiled and allowed to stand some time before
receiving the filler, or until the oil has been absorbed into the pores.
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