Wow, thanks everyone. I appreciate the point in the right direction.
Franklin, do you mean putting a heatsink over the coating, or having a heatsink directly attached but protruding from the coating (partially covered)?
I suppose I'll have to wait until I build is finished to see how hot it will be. I'm developing on a Diecimila, but the final build will be on a Nano.
I finished my software tonight, I'm so happy. Now I have to wait on parts. 