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If you have recently installed spray foam insulation in your house, shop or business, chances are pretty good you will need to coat it with fire retardant paint. The fire marshal is usually happy to explain that to you, and not let you back in the building until it is painted.We get a lot of business from people who didn't know they had to paint their foam. I love those folks.There are really just two standards - a 5 minute ignition barrier (for inaccessible crawl spaces), and a 15 minute therma …