Check on having the hull soda blasted. That's where they use baking soda instead of sand. The surface has to be VERY clean. You also need to use a self etching or epoxy primer on aluminum. It is vital for adhesion and duration of your topcoat.
BTW, $600 is dang cheap! If you take the time to do it right yourself, you will understand this completely!
I tell ya what, I don't know that I could do it for that price but, send me the dimensions on your boat and I'll see what I can come up with. I'd like to try one out! There's a lot that goes into making these finishes last.
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