Insulate first, size the heater with the formula, and skip the unvented ones. A 30,000 BTU unvented propane heater puts about seven gallons of water a day into your shop air, and it lands on your cast iron.
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Materials, real hours, overhead, fees and profit. The five-line formula that stops makers quoting $60 for a board that cost $61 in walnut, plus what to say when a friend asks for mates' rates.
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Rust on shop tools is a dew point problem, not a cleaning problem. Three layers, in order: get the air under 50 percent, stop the metal running colder than the room, then coat what is left.
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