Dry sand small areas question

Discussion in 'Boatbuilding' started by Clyde, Jul 27, 2023.

  1. Clyde
    Joined: May 2022
    Posts: 2
    Likes: 0, Points: 1
    Location: Cleveland, OH, United States

    Clyde New Member

    Hi
    Purchased a boat that has been repainted here & there & looks nice
    Except
    A couple areas there were 1" - 2" repairs where the previous owner squared off areas with tape, primed the areas then painted
    He didn't feather out the primer so there are these little squares...
    I'd like to dry sand them to feather out down to the primer then repaint...
    Is this possible?
    Thanks in advance!!
    Clyde
     
    Clyde, Jul 27, 2023
    #1
  2. Blueknarr
    Joined: Aug 2017
    Posts: 1,456
    Likes: 419, Points: 83
    Location: Colorado

    Blueknarr Senior Member

    Congradulations and welcome to the forum.

    Possibly depending on the paint involved.
    However
    Most dry sandpaper will leave noticeable scratches when top coated by most marine paints.
    Wet sanding with 400 or 600 grit would have cosmetic advantages.
     
    Blueknarr, Jul 27, 2023
    #2
  3. Clyde
    Joined: May 2022
    Posts: 2
    Likes: 0, Points: 1
    Location: Cleveland, OH, United States

    Clyde New Member

    Understand that...
    I was hoping to use a buffing compound to possibly eliminate any scratches
     
    Clyde, Jul 27, 2023
    #3
  4. Blueknarr
    Joined: Aug 2017
    Posts: 1,456
    Likes: 419, Points: 83
    Location: Colorado

    Blueknarr Senior Member

    No go with buffing compounds.

    You need to eliminate scratches before top coating. Buffing compounds leave a residue that interfere with adhesion of top coat.

    Wet paper can be used dry but it clogs fast.
     
    Blueknarr, Jul 27, 2023
    #4

  6. fallguy
    Joined: Dec 2016
    Posts: 7,647
    Likes: 1,689, Points: 123, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Most two pak or two part polyurethanes are impossible to blend. If he had sanded with a high enough grit; the scratches would not show much at all, but a haze would. The trouble is that it is not possible to feather or buff many paints the way you wish.

    The best plan is to address the issues at repaint time for the entire boat.
     
    fallguy, Jul 28, 2023
    #5
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