No powder coating for aluminum?

Our ancient (1986) Cannondales could use some refinishing. The paint has
bubbled and chipped in places, exposing the aluminum. The bikes aren't
grossly ugly, but they're far from pristine. I think the original paint
is DuPont Imron, or some similar catalyzing paint.

I was given information about a local place that does a good job with
powder coating, and is not very expensive.

But I got to thinking: The bikes are 6061-T6 if I remember right. And I
think powder coating gets baked at a higher temperature than the
aluminum did. I'm finding that T6 heat treatment involves about 350
degrees Fahrenheit, but powder coating uses about 400F. That makes this
sound like a bad idea.

Is there something I'm missing?

--
- Frank Krygowski