Gyrobob
Serious Thumper
Offline
Posers ain't motorcyclists
Posts: 2571
Newnan, GA
Gender:
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The posts above saying surface prep is important didn't state the case strongly enough.
If I were going to do the exhaust pipe and muffler, I'd sandblast the thing to get a rough matte surface finish, then,,,, "DON'T TOUCH IT!!" Maybe blow it off with compressed air right before you paint it, but don't touch a to-be-painted surface with anything.
I build gyrocopters that, when airborne, have the engine running at about 75% power,... enough power to keep the exhaust header a dull orange color. The only rattle can paint that holds up for more than a few minutes, believe it or not, is Dupli-Color hi-heat black,.. and even IT has to be redone every 50 or 60 hours. It's not pretty, but it does stick. I only fly the thing about 10 hrs monthly, so 60 hours takes about half a year.
I'll admit I haven't tried some of the newer hi-heat rattle cans for a few years,... once I find something that works, I am reluctant to fool around with it. So,.. there may be some newer products that work as well, but for now I'll keep using Dupli-Color hi-heat black.
To cure mine, I set up a small portable heater blowing into a wardrobe box,.. the stiff cardboard kind that is used when moving. I do that for a an hour a day for several days. It probably gets up to 120 degrees in there. Then when I install the exhaust system, I let it run a few times at low power for a few minutes each time before I run it at full power.
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