Don you can also use a good synthetic grease on your bits and sanding rolls. This makes your carbide bits and abrasives less aggressive and helps bits with heat. Any grease will do, I use a Amsoil product as it has a very high burning/smoking point. Some even use tallow.
PS- You can also use ferrous carbide bits on your aluminum head. Used with grease they work well in getting things smoothed out. Obviously use the non-ferrous bits for faster removal.
Todd