Intense cold favors the action, when all paints
become very brittle, a fact much to be seen on low-priced vehicles in
winter time. Damp in wood will also hasten it, as stated in
blistering, the woodsap undermining the paint.
To avoid peeling and blistering, the paint should be mixed with raw
linseed oil in such proportions that it neither becomes too brittle
nor too soft when dry. Priming paint with nearly all oil and hardly
any pigment is the foundation of many evils in painting; it leaves too
much free oil in the paint, forming a soft undercoat. For durable
painting, paint should be mixed with as much of a base pigment as it
can possibly be spread with a brush, giving a thin coat and forming a
chemical combination called soap. To avoid an excess of oil, the
following coats need turpentine to insure the same proportion of oil
and pigment. As proof of this, prime a piece of wood and a piece of
iron with the same paint; when the wood takes up part of the oil from
the paint and leaves the rest in proportion to harden well, where at
the same time the paint on iron remains soft.
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