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Don't use Kilz Latex anything...Use Zinsser Cover Stain Oil Based Primer. You can fill over it as needed. Apply again. Overall use oil based primer. Sand with #220.

If you want to upgrade from Bondo use 2 part Epoxy filler. Does take about 4-6 hrs to dry thoroughly. Can use a heat gun to speed it up. I think this material was originally for "Fairing" or Fairing Compound as in Boat Fairing...repairing wood boats.

https://www.rotdoctor.com/products/fillit.html

https://www.jamestowndistributors.c...airing Compounds and Repair Putties&category=528&refine=1&page=GRID#/perpage:16
 
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