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did you use a primer? I'm not sure what kind of thinkg you're talking about, but I've had tons of luck painting everything from wheels to shift knobs to dash pieces, in aluminum, acrylic, various plastics, and steel. All I do is get rattle cans of primer, color, and clear coat, and put two or three thin coats of primer, five or six thin coats of color, and five or six thin coats of clear (YMMV) and it turns out perfect regardless of surface prep...I've never 'roughed anything up'...my shift knob was glassy smooth acrylic when i painted it, it is a high-wear item, and it hasn't worn down the paint at all...i did like 8 or 9 clearcoats on it, though, but it still held up remarkably well.
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