I'm partial to the Dyna-Tron brand. Same company as Bondo, but it's their professional line, much better product. Dyna-Lite for the basic filler, and Putty Coat for glazing/spot filling. Both work very easily and finish out smooth. Bondo also has a catalized spot putty out that comes in a tube (like the old red glazing putty that takes forever to set up), it's somewhat like regular Bondo, but is much thinner in consistancy and applies much smoother.
