I found three sprayable body fillers 1. Featherfill by evercoat 2. Slicksand by evercoat, slicksand kind of replaced featherfill as far popularity 3. Z-chrome by Clausen Sprayable body filler is also called, Polyester Primer Surfacer. Does any of the professionals out there have any opinions. When would you use any of theses products over the coventional spread on bondo. Thanks in advance.