Spraying house paint, cheap?

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Going back to the original post - I'll pass on some history related by my grandfather.
He worked for Penn-Central railroad for most of his life, and for a good portion of it was in charge of a Cleveland area freight car maintainance center in. Freight cars are subjected to very harse conditions, and were painted with a very high solids, linseed oil based paint. Normally, each car was scheduled for repaint every three years, with an inspection at two.
They were manually scrubbed with a stiff brush and aggressive detergent, then scraped prior to painting. Painting was done by hand, with natural bristle brushes. According to him, brushing is the only way to ensure good adhesion - the bristle action loosens any remaining oxidation and creates a solid bond of the new paint with the old. ID numbers for logisitics were hand stencilled on each car, using a stiff brush and hand-cut stencils.
At one point in the late 60's, a "college hotshot" (grandpa's term) manager was hired, who determined that spraying the cars would save lots of time and money. Those in the know argued against, but were over-ruled, labelled as being resistant to change.
All the cars painted that summer were back on the siding by Thanksgiving, with paint peeling and missing ID numbers, and causing a major overtime and making a mess out of the central tracking system. Guess what happened to the "hotshot".....

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