Domestic sealer/adhesive

Discussion in 'Materials' started by gtflash, Mar 30, 2017.

  1. gtflash
    Joined: Jun 2006
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    Location: uk

    gtflash Senior Member

    Hoping someone whom understands polymers and all that stuff can help.

    I have used this sealant in the home with massive success, and now I need a sealer for bonding seats to deck (using mechanical bolts too). I have been so impressed with this stuff I am tempted to use it on the boat. Sika 291 is the only real locally obtainable marine grade adhesive and I've had a few failures over the years.

    If anyone can help I'd appreciate it. Data sheets mean nothing to me with adhesives.

    http://www.everbuild.co.uk/clear-fix
     
  2. rasorinc
    Joined: Nov 2007
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    rasorinc Senior Member

    When you factor in all the info for adhesives, EPOXY always wins.
     
  3. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Sika 291 is an adhesive/sealant, not a true adhesive. Typically it's employed as a bedding under things that are mechanically attached.

    The product you've linked is a silicone caulk type of product. It has some adhesive properties, though it's elongation isn't terribly impressive, as these types of sealants go, being about 1/3rd less than typical polyurethanes used in the same role (Silka291 is about 5 times better than this stuff in elongation).

    Maybe it would be more helpful to tell us what you'd like to use this goo for.
     
  4. gtflash
    Joined: Jun 2006
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    gtflash Senior Member

    By elongation does that mean elasticity? How do they display physical adhesiveness in the data sheets I couldn't work it out. I was curious about a pro's point of view as it sounds such amazing stuff and has worked very well for me around the house.

    In this instance I have two stainless seat bases with stainless seat mounts fitted to them. I am fixing them to boat deck (painted grp). I have already abraded surface and as the deck is a foam core I have hollowed out some of the core and epoxied stainless "big heads" into the deck and finished them flush. I now have 10 m8 stainless nuts mounted in the deck per seat and in reality all I need is waterproofness but some added grip can't hurt in my mind.
     
  5. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    These types of sealants aren't going to hold much, by way of grabbing the threads of a fastener. They will act as a bedding under mounting flanges and this is the role they're intended to be employed. If you want to "glue it", use epoxy. If you want to bed it, to keep out moisture use a caulk (adhesive/sealant), such as BoatLife, Sika 921 or one of the 3M products, like 5200, 4200, etc. Of the 3M products, 5200 is more aggressive an adhesive then Sika 921
     

  6. gtflash
    Joined: Jun 2006
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    Location: uk

    gtflash Senior Member

    Thanks Par. I don't need to glue just waterproof so will stick with one of the cauks suggested. Much appreciated.
     
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