Best way to paint polished alloy? Cheap china upgrades.

[RCbutcher]

I have acouple cheap silver upgrades I think they're polished i know its not the best move to paint parts but I don't mind its only a gearbox case and servo posts. Nothing that will scrape. 

 

I'm thinking to lightly sand them with fine wet/dry. Primer idk? My paint says fine without then should I clearcoat?

 

Its just making a use for paint left over from the body. Whilst adding more purple to the chassis. 

[.AJ.]

Make sure you use etch primer 👍 

[RCbutcher]

Etch primer?  Is it crucial to prime and more so to use this stuff. I've never heard of it tbh lol. But I'm very basic on this stuff happy to learn though. If it goes well I'll do the same for the other kid. 

[DartmoorTrails]

Etch Primer is a paint that is designed to physically bond itself to the substrate to which it is applied. This is achieved by combining an acid with the paint so that the acid microscopically etches the surface of the substrate, thus forming a physical and chemical bond between the two.

[RCbutcher]

Excellent I received a tin of it yesterday hoping to start tonight. 

 

Do I need to sand them lightly or isn't that needed with etch primer heres the parts ill be trying to paint. I have upto 3000grit wet/dry paper I think if needed.