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Question About Priming and Block Sanding

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Question: does this sound right to do? Please help……….. body filler  then epoxy primer ppg, and then sand 320 grit then clean and then another coat epoxy primer then water sand 320 grit then sealer. thanks.

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Comments

  1. I would not try to sand the epoxy primer. It does not block out well.

    1. You said that you stripped the fender to metal.
    2. Use 80 grit or courser sandpaper to rough up anywhere that you are going to apply body filler. This will help stick good.
    3. Apply and block sand body filler. Finish out body filler in 150 grit.
    4. Make sure anywhere that primer is going to be sprayed is sanded.
    5. Clean fender with wax and grease remover.
    6. Spray with 1-2 coats of epoxy primer.
    7. Allow Epoxy to dry for recommended time. (Do Not Sand) This may vary so read the p-pages for the brand that your using. Many require the epoxy to dry at least 30 minutes to 1 hour before spraying anything on top of it. However, no longer that 3 days.
    8. Spray primer surfacer 2-3 coats
    9. Allow to dry.
    10. Guide coat and block sand with 320.
    11. If it looks good lightly hand sand it with 400-600 sandpaper and you are ready to seal and paint.
    12. If you still have scratches or pinholes left you will need to repeat steps 8-11

    So basically you have the right idea, but use a primer surfacer to block sand rather than the epoxy. PPG has some great 2k primer surfacers like K36. Shopline also has a less expensive primer which is JP202. You may ask your paint store about these products.

    Thanks,

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