I masked off the cockpit area in preparation for painting. I decided to leave the stainless steel firewall bare to make attaching insulation easier in the future. I used corrugated cardboard cut to size and attached with plastic tie wraps through the nut plates where I could. I discovered that you don't need to close the tie wrap, the friction of pulling it through a nut plate is enough to hold it in place. I threaded the tie wrap through a hole in the cardboard and then up through the nut plate. Then I trimmed the excess tie wrap. I used short lengths of 1/8" wood dowel plugs to mask all the screw holes so I wouldn't have to worry about gummed up threads.
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