RustyDusty's not so rusty "Aluminium Polishing Tutorial"

Just like anything else Rusty, it takes practice. I also use a 1 3/4 hp commercial buffer which I suspect is quite a bit more effective -- and spins a lot faster -- than your modified bench grinder. If you're going to take your polishing to another level above your own DIY projects, you might consider stepping up.

Here's a couple pics of one of my recent projects for a customer. I'm not going to show off everything (yet :-D), but here's what his Barracuda's interior grille surrounds started off looking like ... a few layers of old paint, glue drips and even some fiberglass stuck on it here and there.

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... and where the first ended up using my techniques.

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(That's a reflection of the woods behind my shop.)