Dimensional influences of Brite Dip Polishing Aluminium

[whistule]

I have read that Brite dip polishing is a far superior way of polishing aluminium to mechanical polishing. Is this true? Can anyone say if it hardens the surface in any way and what dimensional effect does it have on the part - it gets smaller I presume ?

Could you then anodise the part after Chemically polishing it this way?

Any help much apprec.