I also used the Duplicolor Aluminum ( #1612 , I think) and it is holding up very well. It was my first time painting an engine and I definitely did not prep it as well as I should have. But even considering this, the paint has held up. I've heard great things about VHT and PJ1 also. Best of luck on your project, if you have any questions....don't hesitate to ask. All the guys on the forum are awesome at helping and providing advice.