Painting my case which is brushed alu surface..how to remove the anodize before painting?

any secret formula or something?

u can't !

iirc, anodize was a coating process, once done really hard to remove, even hard to scratch, which was it's purpose.

there still a process to remove it. let me ask my friend who work in this fabrication shop.

thanks albert

share share here after uve ask ur fren about it

ive google but not much solution..maybe u guys got some trick or anything

Its easy, but you'll need practice and some chemicals (Sodium hydroxide). Best if you try out on something else first (something aluminium) to get the concentration right, it too diluted it'll take forever, if too concentrated it'll burn holes in your casing (not to mention yourself too; when diluted its not more dangerous than clothes detergent, don't worry ).

1 rule though, make sure you do it in a well ventilated area with no flames (casing flames ok )..process releases hydrogen..

Anodisation isn't a coating, its the aluminium itself, purposely oxidised with a thicker layer than usual while being soaked in colouring. Aluminium oxide is unlike most other metal oxides, its much harder than the original metal (in fact, harder than steel), and its non-porous, meaning when a thin layer is formed, it dosn't allow the metal underneath to oxidise further. So to get a thicker oxide layer to protect and strengthen the aluminium, it is electrolysed in weak acid to burn microscopic holes in the oxide surface and oxidse the metal underneath (not possible to oxidise the whole metal without ending up with holes in it though ). A side benefit is that the microscopic pores created during anodisation also allows dye to be diffused into the metal.

In case you want to know how hard aluminium oxide can be under ideal conditions, its a primary element in many precious stones (sapphire, emeralds). Which can cut damn near any household item.

thanks bro wenli

this way is very hard to come by for me

so the best alternative is sanding and alot alot of sanding