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Thread: Help - Need To Make a Mold

  1. #1
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    Help - Need To Make a Mold

    My 16 OB, The Mule, finally sprung a leak in it's fuel tank.

    In my boat the tank is under the splashwell all the way back. I am thinking I may just leave the old tank in place to avoid all the cuts and install a new belly tank in front of it. On the 16's you can pull up the 30" long floor locker and expose the keel. What products could I use to make a mold of the "curve" of the keel that could then be removed? My goal is to follow the exact curve of the keel and then use that base to give to my shop to create the shape of the base of the tank to use every inch of space. The only thing that came to mind was soaking a thin piece of 13" wide Luan Plywood in water overnight, then drop it down into the keel with a heavy round pipe on it and come back a few days later! Not the greatest idea I'm sure.

    Anyone have thoughts?
    1972 16 OB - C16B-63 - "Surface Tension" Resto Project
    1974 16 OB - DMR16106017-B - "The Mule"

  2. #2
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    Maybe some type of plaster of paris / paper mache product spread over waxed paper or plastic wrap laid down on the inside of the hull?...


    Frank
    Triple Hatch.
    It's a classic Donzi, not a Donzi Classic.

  3. #3
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    You could always line it with wax paper and pour in 2 part expanding foam. The you would have foam model.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1982 PolarKraft -Jonboat - Crab Killer

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    Quote Originally Posted by f_inscreenname View Post
    You could always line it with wax paper and pour in 2 part expanding foam. The you would have foam model.
    That's even better!


    Frank
    Triple Hatch.
    It's a classic Donzi, not a Donzi Classic.

  5. #5
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    Save some foam when pouring it throw some soda or water bottles in it to fill up some space.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1982 PolarKraft -Jonboat - Crab Killer

  6. #6
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    Thanks, good idea for sure. What kind of foam would you suggest?
    1972 16 OB - C16B-63 - "Surface Tension" Resto Project
    1974 16 OB - DMR16106017-B - "The Mule"

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    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

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    Quote Originally Posted by Ghost View Post
    Hell Mike I would use the 2lbs for just making a mold.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1982 PolarKraft -Jonboat - Crab Killer

  9. #9
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    Quote Originally Posted by f_inscreenname View Post
    Hell Mike I would use the 2lbs for just making a mold.
    I thought that tooŚlooked and their web site specifically says use 3 or 4 for a mold. Maybe that recommendation is if you need to shape/cut it a bunch rather than just pulling it out.
    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

  10. #10
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    Quote Originally Posted by Ghost View Post
    I thought that tooŚlooked and their web site specifically says use 3 or 4 for a mold. Maybe that recommendation is if you need to shape/cut it a bunch rather than just pulling it out.
    Anyway its just a couple bucks difference.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1982 PolarKraft -Jonboat - Crab Killer

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