Thread-locker for Stainless Fasteners in Fiberglass?

Discussion in 'Fiberglass and Composite Boat Building' started by fly186, Mar 6, 2017.

  1. fly186
    Joined: Nov 2016
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    Location: Florida

    fly186 Junior Member

    I'm tapping 1/4-20 threads into some solid glass laminate that I made with epoxy resin and layers of 1708 biax. This laminate is 1/2" thick. This is for an 8' VHF antenna mount. Can I just use some 5200 (a SMALL amount) on the threads of the stainless fasteners to hold them in place and to prevent backing out? Could I just use some silicone caulk instead?

    Thanks
     
  2. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Neither 3M5200 or silicone caulk is a very good idea. A dot of superglue on the threads, as it's being driven home will lock them in place, as will epoxy, which is the easier to remove choice, when this time comes again.
     
  3. fly186
    Joined: Nov 2016
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    Location: Florida

    fly186 Junior Member

    Good idea, I'll use a little epoxy.

    Thanks.
     
  4. messabout
    Joined: Jan 2006
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    Location: Lakeland Fl USA

    messabout Senior Member

    You can use epoxy, cyano acrylate (super glue), or Locktite which is another anerobic adhesive commonly used by engine builders and other metal craftsmen.

    When you want to remove the fastener the fun begins. Here is a method that can save some grief. Use a soldering iron to heat the fastener. Heat it until the adhesive becomes somewhat resilient. Now you can unscrew it if you do it quickly before the adhesive resets. That takes a little patience but it is worth the trouble.

    There will be some adhesive residue on the fastener and also in the tapped hole. Use a tap to clean up the internal threads and a die or other cleaner upper for the fastener.
     
  5. Sparky568
    Joined: Jan 2017
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    Sparky568 Junior Member

    I used locktite. It even works on setting small cutlass bearings without the setscrew(s).
     

  6. fly186
    Joined: Nov 2016
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    Location: Florida

    fly186 Junior Member

    Thanks. I have plenty of Loctite. That was my first thought but wasn't sure it would work on glass but it's non-porous so should be fine.
     
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