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Technical Permatex #1 to smooth a rough casting

Discussion in 'Traditional Hot Rods' started by James Mundstock, Sep 30, 2020.

  1. James Mundstock
    Joined: Jun 13, 2017
    Posts: 38

    James Mundstock

    I have a leaky radiator hose on my Flathead. I have tried many methods to stop it. My thought was to put a smooth coating of Permatex #1 and let it harden to smooth the rough casting. Then sand it smooth to creat a better surface to seal. Any feedback will be appreciated.
     
  2. gearheadbill
    Joined: Oct 11, 2002
    Posts: 1,305

    gearheadbill
    Member

    Might be a better product to use like Devcon or JB Weld. Both are 2 part epoxy that are sandal. As long as the casting is clean, shouldn't be a problem.
     
    jimmy six and tb33anda3rd like this.
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 46,844

    squirrel
    Member

    I'd use JB weld. The gasket sealer probably won't do what you want, but will make the hose stick, and cause problems in the future.
     
  4. lostone
    Joined: Oct 13, 2013
    Posts: 1,355

    lostone
    Member
    from kansas

    ^^^ jb weld
     
    seb fontana likes this.

  5. alchemy
    Joined: Sep 27, 2002
    Posts: 15,847

    alchemy
    Member

    What's rough? The head or the water pump? I'd actually like them rough a bit so the hose will get some bite and not slip off. The rubber in the hose will conform to the sandcast surface and give a nice grip.

    If you have a deep scratch maybe just fill the groove, but not cover the rest of the surface.
     

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