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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


    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


    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

    from kansas

    ^^^ jb weld
    seb fontana likes this.

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


    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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