big.eck your avatar is very distracting
it is isnt it , i know its there but keep looking regardless
a dent puller is a slide hammer . drill a hole or weld on a screw and attach that to a pole with a floating handle that slides along its length , tug on it hard enough and it hits the end and pulls whatever the screw is in , be it a dent or ignition barrel
if it was thin steel invisible dent removal might work if the tube is open enough to get the tools in
oh and i dont think you can powder over anything other than the steel ? i was told itl only adhere to metal and the filler would pop off