What body filler/putty do you use?

I'm currently using 3M Glazing & Spot Putty and find that my work is becoming two steps forward, one step back.

There's got to be a better product.

Suggestions?

Source: http://cs.scaleautomag.com/SCACS/forums/thread/968189.aspx

Don Beauman Karl Gunther Bechem Jean Behra Derek Bell