I don't know how well paint sticks to polished aluminium, but you'd need to use a high temperature paint for the pipe. You might need to scuff the aluminium a little bit with some fine-grade wet & dry to get the paint to stick well.
I painted some old school wheels for one of my RX7s..
In the center I used some zinc based primer,is what you need for aluminum.Then I painted the center,and then use a shit load of clear coat.. this was all from a can.You couldnt even tell.
The center was cast,very pitted from the cast,so it helped it stick easy..
I polished the lip..
If you are using the 2 step painting idea,go to the paint shop and ask for a primer its called something like Y2K,mention that and you are looking for zinc primer.You need it on aluminum or it wont stick at all.You will have to scuff it up some,and the zinc primer helps fill it in some.
you dont need primer.just clean all the polish and scuff.then you can paint with a high heat engine paint.ive had really good results from dupont engine paint with ceramic.i did my frame,swingarm,subframe,passenger pegs and yes even the rearsets.it has all lasted well even the rearsets for all you people who say you have to powdercoat.i used low gloss black.heres a pic.only frame and subframe were done at this point.hope it helps.
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