I was told in one post to never put filler over etching primer. They tell me it will not stick. I understand it is best to put down a layer of etching primer, then 2k primer, then the filler.
here is the post:
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=4;t=003984;p=1#000005
