How do i prepare the aluminium sheet to paint with oils on it?Do I have to buy special aluminium or any kind will work?
Any aluminium will do. Sandpaper it 3 times with decreasingly coarse grain papers, clean it thoroughly with turpentine and then apply 3 coats of white oil based paint. Gesso would do too, but you'd have to use more layers
Paint will peel off from Aluminium. Embossing can be done.
Prep and clean with vinegar