Hull sanding

Discussion in 'Fiberglass and Composite Boat Building' started by Rawl3610, Jun 27, 2018.

  1. Rawl3610
    Joined: Sep 2015
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    Location: Essex

    Rawl3610 New Member

    Hello can anyone tell me what’s the best way to sand back to gell coat inbetween my tri hudural hull ?

    I have a da but it won’t go round corners obvsisilly
     

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  2. sdowney717
    Joined: Nov 2010
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    Location: Newport News VA

    sdowney717 Senior Member

    Maybe can you make a curved scraper and use a heat gun?
    I dont know how a heat gun would affect the gel coat. Why do you need to remove all bottom paint?
    How about hand sand with real coarse grit paper.
     
  3. kapnD
    Joined: Jan 2003
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    Location: hawaii, usa

    kapnD Senior Member

    Wet media blasting is very effective at doing exactly that.
    It is very controllable and it washes away the residue that a sander keeps grinding back into the gelcoat.
    Best of all is that it creates no dust!
     
  4. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Why are you removing the paint (anti-foul ? )
     
  5. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    padded da with 36 grit paper; the paint will go EVERYWHERE, I recommend tenting the job; a nice thick pad will allow some curving of the paper as you go, for stubborn areas, buy some 36 grit floor paper sheets from the tool rental at HD or some other vendor and cut it by hand (yup, by hand). The DA can go too fast on hard chines and the 36 cuts well

    you don't say what you are coming back with

    if you are gelcoating; you might consider a gelcoat peeler instead; I have only seen videos, never did it
     
  6. fallguy
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    fallguy Senior Member

  7. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    I saw an example recently of a very good hull wrecked by a fool with an angle grinder/sander, taking off anti-foul, then painting the boat. The innumerable score marks came up lovely :eek: with the high gloss finish. There is little performance dividend in removing anti-fouling. half a knot if you are very lucky.
     
  8. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    Right on.

    This is why I asked the plan. If you are planning to paint, sanding with a DA and 36 grit is probably not the right idea!
     

  9. Barry
    Joined: Mar 2002
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    Barry Senior Member

    rent a portable dry ice blaster,
    you can check out the internet for videos on this
     
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