Im in the process of preping my z6 intake manifold but theres this white powder dust that appears. I re wash it with with water and somehow white dust appears on the surface of the intake manifold when it dry off wtf? i washed it like almost ten times now and dried it.
I want to paint it but not sure if this white powder on the manifold will cause it problem..

 

Thats how aluminium rusts.
A brass wire brush and some self etching primer for high temp applications should work. Mask the gasket surfaces.

 

Can i try paint over it will the stuff paint stick i tried getting it all off but some crap still on there dammit... I just paint it already or any way to remove it

 

Just get as much off as possible with a brush. The acid in the self etching primer will eat through and chemically alter the oxidation.

To be sure try a little on the bottom and see how it finishes.