Removing old paint from a fibreglass hull (exterior)

Discussion in 'Materials' started by valvebounce, Aug 9, 2013.

  1. valvebounce
    Joined: Dec 2010
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    Location: manchester uk

    valvebounce Senior Member

    I have a 13ft speedboat hull that has quite a few coats of paint on the exterior.It has crazed cracks in the paint which are very deep.
    If I attempt to sand it the wheel or sanding sheet fills up in seconds.
    Is it possible to use a liquid paintstripper on it without damaging the fibreglass hull?I have contemplated using a blowlamp and scraper,but I dont know if it would damage the strength of the hull.
    Any advice will be gratefully recieved.
     
  2. dinoa
    Joined: Oct 2007
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    Location: florida

    dinoa Senior Member

    water-sand blast does a good job

    dino
     
  3. michael pierzga
    Joined: Dec 2008
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    Location: spain

    michael pierzga Senior Member

    I suppose you can use paint stripper. Ive never used it on fiberglass

    Google a paint site like International and see if they have any strippers that dont effect polyester.
     
  4. valvebounce
    Joined: Dec 2010
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    Location: manchester uk

    valvebounce Senior Member

    Thanks for the info Dino/michael.
    V
     
  5. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    Yes, you can use a chemical stripper, though look at the can - some are compatible with 'glass, others will eat it up, so don't learn this the hard way and read the can.
     
  6. valvebounce
    Joined: Dec 2010
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    Location: manchester uk

    valvebounce Senior Member

    Hi PAR,long time no see.
    Thanks for the advice.I am still plodding on with the boat.I have cut a transom pattern,and managed to get a 6" upstand either side of the motor for the "splash"I have marked it out to 26" and 28" like you suggested,but not made the cut yet.
    I have a dummy transom on my bench,so I am going to try the motor radius swing and mark it,allow half an inch either side for clearance then transfer the measurement to the transom pattern.The motor is Tiller steer.
    Purely from an interest point of view,I was informed by a friend who is a tinsmith on rolls royce marine deisel engines that the hull on this boat is the same design as the raf rescue boats that were used in ww11,and Lawrence of arabia (Shaw) was the designer.
    The last remaining boat was salvaged from Malta,and has been brought back to it's former glory at the cost of £500,000.I have the write up on it and pictures if you are interested in having a look.Apparently,it was the fastest thing on the water for many years.
     
  7. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    Paint strippers can damage gelcoat for sure, maybe the citrus based ones are friendlier than the older style strippers.
     

  8. valvebounce
    Joined: Dec 2010
    Posts: 537
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    Location: manchester uk

    valvebounce Senior Member

    Thanks Mr E,looks like I will have to research it,and read the can.
    The boat isn't anything to shout about,just my little project,it's getting to the point where I am thinking about the paint job.
     
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