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Filler on Bare Metal or Primer


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Just finished putting in some sill repair sections (non TR) and need to apply a thin skim of filler before finishing. So have some original painted metal, some primed fresh metal, and some weld. I quickly gave it a thin coat of primer after welding to stop initial rust, but now need to fill and finish.

 

Can I apply filler on top of paint & primer or should I get everywhere where filler is to be applied back to bare metal first. NB it will only be a thin skim I guess ranging from about 1-2mm down to a feather edge.

 

Alan

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Go back to bare as there could be anything under the paint.I always bare everything then coat with Bondarust while the rest is done then 80 grit the Bondarust for a proper key then fill where required. I always use a quality filler too (UpolD)

Stuart.

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I've always preferred filler directly on bare metal, but the maker of the epoxy primer I use now recommends filler on top of the primer, claiming better adhesion.

 

Ed

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Go back to bare as there could be anything under the paint.I always bare everything then coat with Bondarust while the rest is done then 80 grit the Bondarust for a proper key then fill where required. I always use a quality filler too (UpolD)

Stuart.

 

+1 every time.

Edited by iain
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