67 Dart Post Project

Are you using a mig or a tig welder? Mig -- especially without a gas setup -- can introduce a lot of air which heats up during the powder cure and can blow out through the powder. The results can be felt to the touch and up close look like a bunch of little teeny volcanoes. When you drop it off, make sure you ask them to thoroughly outgas it. If they don't know what you're talking about, please take it somewhere else.