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Do You Have To Prime Before Bondo? [Solved]
NO, never. bondo goes over bare steel only.27 Apr 2018
Tech Tips: The Do’s and Don’ts of Body Filler
Tom Cornelius, 3M application engineer, shares best practices, tips and tricks for mixing and spreading
Filler over primer? The proper way it can be done
Polyester
What’s Right? Body Filler Over Epoxy Primer or Bare Metal?
This video will help