How long for filler primer over epoxy primer?

Discussion in 'Body Restoration' started by badazz81z28, Aug 29, 2020.

  1. badazz81z28

    badazz81z28 Veteran Member

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    According to the epoxy primer I used, it says it take 5 hours to be dry to the touch, can be sanded in 12 hours....but when can I put filler primer over it?
     
  2. Ihada70Z28B4

    Ihada70Z28B4 Veteran Member

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    I wait a minimum of 24 hrs with SPI. 24-48 if it's 3 coats.
     
  3. badazz81z28

    badazz81z28 Veteran Member

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    What grit to scuff it with?
     
  4. badazz81z28

    badazz81z28 Veteran Member

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    Dangit!! Looks like I missed some areas! What do I need to scuff to re-shoot epoxy?
     
  5. bodymanbill

    bodymanbill Veteran Member

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    All brands are different so read the p-sheet for what brand u have, most epoxies u can recoat without sanding in a72 hour window but I usually still scratch it up with 150 or 220. On my car I sprayed everything with PPG Dp90 than stick sanded with 150 than mudded or high build primer. Never seen epoxy that was 5 hours dry to touch but if im high building straight over epoxy I usually wait around an hour than prime.
     
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  6. badazz81z28

    badazz81z28 Veteran Member

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    I might not be using traditional epoxy. Its advertised as Epoxy Primer. The sheet says in 12 hours you can sand with 400-600 and wet sand with 800. Its not what I expected either...it not really a smooth surface. Its kind of textured....
     
  7. hubedobeedo

    hubedobeedo 3rd times a charm

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    kinda like spaying paint right set up and follow manufacturers recommendations. mine for what i used layed down smooth ,was a wet on wet for high fill prime. all same manufacturer.
     
  8. hubedobeedo

    hubedobeedo 3rd times a charm

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    back in the 80's used the DP just like you said ,had some nice final finish jobs were top coated with PPG.
     
  9. hubedobeedo

    hubedobeedo 3rd times a charm

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    need to follow manufacturers recommendation. i could tell you wrong would not like that idea,ask for tech sheet check company web site don't rely on (i don't even know what brand) good questions wrong place to ask.
     
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  10. Z28Camaro1979

    Z28Camaro1979 Veteran Member

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    I've always did my repairs, and or cover any bare metal with a filler primer PPG, did all my finish sanding to 360 or 400 wet 3m paper and and then used PPG epoxy primer thinned as a sealer over the filler primer...only time I use epoxy primer as a filler is over fiberglass, mostly Corvettes...takes a while to cure and is hard to sand...it balls up on the sandpaper, wet or dry....and with the epoxy catalyst added it takes forever to sand...many shops use heat lamps or heated dry booths to basically bake the sealer or primer to speed up the cure time, seems to sand better...if your working on your own, spray it, let it flash off completely, move outside and let the summer sun bake it...
     

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