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Body Filler: Can Bondo Be Applied Over Paint? "Sanded Paint or Bare Metal"

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Published on Oct 30, 2012

This is a common question I have been asked many times. Whether you're a "die hard must be to the metal fanatic" or you're quick to "apply bondo over anything kind of a guy", you may want to read this or watch the video before your next body filler job.

I was taught that body filler must be applied to bare metal. Therefore, all coatings must be ground or sanded to bare metal before applying body filler. However, I learned auto body repair during the lacquer/enamel days. Since then urethanes started being used on cars and some technicians started applying body filler over roughed up paint. However, if applied over a sanded paint surface, it must be an OEM substrate. This means a factory paint job that has never been repainted. Now we have waterborne paint to mix into the equation.

The problem with this practice is the "technician see technician do". Someone notices that body filler is being applied over sanded paint, then they assume this is a standard practice and they start doing the same thing. Before you know it everyone is doing this the same way, but many of them do not have all of the facts. The fact the that paint surface must be an "OEM finish" is the missing link, which leads to filler being applied over all painted finishes.

Watch the video for the full details and let us know what you think. Do you apply body filler over paint?

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