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Thread: Polyester vs. Urethane Primer ? Which to buy and why???

  1. #1
    Join Date
    Apr 2010
    Location
    Sacramento, CA
    Posts
    122

    Default Polyester vs. Urethane Primer ? Which to buy and why???

    Hi All

    So, I'm in my local paint shop on Saturday purchasing some epoxy primer/sealer to prime my bare metal blasted parts. I wanted to also purchase a primer to apply over filler, to use when block sanding panels. Paint shop asked me if I wanted polyester primer or urethane primer. Embarrassed, I asked them why I'd choose one over another. She indicated that if I'm going to wet sand, use urethane primer.

    Decisions, decisions. Why would I purchase polyester vs urethane primer? Wet sanding can't be the only reason.

    Thanks in advance for any info on this decision.

    Pat

  2. #2
    Join Date
    Nov 2005
    Posts
    27,027

    Default

    Quote Originally Posted by TR3_Nut View Post
    Hi All

    So, I'm in my local paint shop on Saturday purchasing some epoxy primer/sealer to prime my bare metal blasted parts. I wanted to also purchase a primer to apply over filler, to use when block sanding panels. Paint shop asked me if I wanted polyester primer or urethane primer. Embarrassed, I asked them why I'd choose one over another. She indicated that if I'm going to wet sand, use urethane primer.

    Decisions, decisions. Why would I purchase polyester vs urethane primer? Wet sanding can't be the only reason.

    Thanks in advance for any info on this decision.

    Pat
    Polyester primer is like a spray-on body filler and is normally more porous than urethane primer. When I have a large area to prime than needs a final touch of filler I will use a polyester primer like Slick Sand block sand dry then I will either apply sealer before painting or I'll apply a 2K (urethane) primer, guide coat, block sand wet then paint. If the area is not large I'll usually just use urethane primer, block sand and paint.

  3. #3
    Join Date
    Apr 2010
    Location
    Sacramento, CA
    Posts
    122

    Default

    Quote Originally Posted by Len View Post
    Polyester primer is like a spray-on body filler and is normally more porous than urethane primer. When I have a large area to prime than needs a final touch of filler I will use a polyester primer like Slick Sand block sand dry then I will either apply sealer before painting or I'll apply a 2K (urethane) primer, guide coat, block sand wet then paint. If the area is not large I'll usually just use urethane primer, block sand and paint.
    Thanks Len

    Looks like I'd want to have both polyester and urethane primer in my paint cabinet. Much appreciated.

    Pat

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