But
water has an influence toward hastening to blister paint; it holds the
unhardened woodsap in solution, forming a slight solvent of the oil,
thereby loosening the paint from the wood, favoring blistering and
peeling. There is a certain kind of blister which appears in certain
spots or places only, and nowhere else, puzzling many painters. The
explanation of this is the same as before--soft paint at these spots,
caused by accident or sluggish workmen having saturated the wood with
coal oil, wax, tar, grease, or any other paint-softening material
before the wood was painted, which reacts on the paint to give way to
air pressure, forming blisters.
The second cause of paint blistering from the ingredients of the paint
happens between any layer of paint or varnish on wood, iron, stone, or
any other substance. Its origin is the gaseous formation of volatile
oils during the heated season, of which the lighter coal oils play the
most conspicuous part; they being less valuable than all other
volatile oils, are used in low priced japan driers and varnishes.
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