I made up a tip with brake line and put it on my old binks undercoating gun. under the door thresholds there are access holes in the fiberglass to get to the top of the frame. you can stick the brake line into any holes in the frame and spray away. put it on the blow gun first so your not protecting the dirt.
also it's almost impossible to tell if your getting good coverage or not.I used industrial grade red oxide steel ship primer,mike.
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