Alu frame respray

I’ve snapped my leg badly while out on my bike. So to pass the time I’ve decided to do one of these retro MTB to Gravel bike project.

I’ve picked up an old alu Orange G2 frame for next to nothing and I’ve been watching video after video on utube of how to do a full respray.

Has anyone done this? Or have any tips or tricks, hacks of how to do it?

I’m going with sandpaper (120, 320, 800) then a good clean, prime, then paint.

Any help or advice is welcome, I know it’s a long process, but time is what I’ve got with my leg busted!