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  1. #1
    Join Date
    Nov 2007
    Location
    North Yorkshire
    Posts
    1,462

    Default Is Sikaflex Still The Sealant Of Choice?

    Been out of boating for a while but now have a half share in a Leisure 23.

    There are some small deck leaks under stantions and the two gib sheet travellers.

    I used to use Sikaflex for re-seating things like this but I hated the stuff as rarely did I use a whole (expensive) tube and then it would go-off in the tube.

    I tried CT1 with some success but sometimes it went crystalline and failed to go off properly.

    Is there something else people use now?

    TY!

  2. #2
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    22,128

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    Toolstation's Puraflex appears to be just the same stuff, made by the same manufacturer, at half the price. Still the best all-round sealant.
    Answers to some technical queries at new website http://coxeng.co.uk

  3. #3
    Join Date
    May 2010
    Location
    Me -Storrington / boat Chichester
    Posts
    745

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    Butyl tape, doesn't set, means the fitting can be removed in the future without destroying the GRP.

    https://www.pbase.com/mainecruising/rebedding_hardware

  4. #4
    Join Date
    Jan 2007
    Location
    River Trent
    Posts
    2,428

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    I've personally found Sikaflex to be over-rated, and have always had great results both above and below the water line with silicone sealants.
    Technology has progressed and they are really effective in most applications, although I guess Sika still has its place for some applications.
    But universal use for everything boaty, definitely not!

    Sika is also horrible to work with

  5. #5
    Join Date
    Oct 2018
    Location
    A Member State of the European Union
    Posts
    7,543

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    I'm interested in CaptainBob's bad experience with CT1.

    I have used it for years and never had a problem with it; even with old stock.

    Was it clear CT1, I wonder?

    The reason I ask is that I was told by someone from CT1 Technical Support that clear CT1 should not be exposed to sunlight.
    "Brexit: like watching a library being burned down by people who can't read"

  6. #6
    Join Date
    May 2009
    Location
    Wirral
    Posts
    721

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    As mentioned butyl tape lasts years without going hard .
    Leisure Owners Association

  7. #7
    Join Date
    Dec 2014
    Location
    N of Ardnamurchan, winter Loch Melfort
    Posts
    956

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    I've had considerable with bog standard bitumastic gutter sealant.. Cheap as chips.

  8. #8
    Join Date
    Feb 2017
    Location
    Largs
    Posts
    13

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    Quote Originally Posted by vyv_cox View Post
    Toolstation's Puraflex appears to be just the same stuff, made by the same manufacturer, at half the price. Still the best all-round sealant.

  9. #9
    Join Date
    Feb 2017
    Location
    Largs
    Posts
    13

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    Quite agree that Toolstation purflex pu40 is the same spec as sikaflex , used it on all my boats for the last 5 years.

  10. #10
    Join Date
    Oct 2002
    Location
    Plymouth
    Posts
    8,783

    Default Re: Is Sikaflex Still The Sealant Of Choice?

    Quote Originally Posted by Minchsailor View Post
    I've had considerable with bog standard bitumastic gutter sealant.. Cheap as chips.

    Never tried it but I note this:

    "BENEFITS OF EVERBUILD ROOF & GUTTER SEALANT: Can be applied in wet conditions, even under heavy rain. Semi drying - remains permanently elastic beneath surface skin. "

    Which sounds good. In the old days every chandlers had tubes of black stuff called something like Sealastic, it was very messy, unsophisticated black gunge but it worked.

    Meanwhile, I am not that keen on Butyl rubber on the strip as it seems too hard to me. So I have just got a tube of this stuff to investigate:

    https://www.marinesuperstore.com/sea...ast-br-sealant

    Which may well just be a yotty, dear version of your gutter seal..............

    https://www.sealantsonline.co.uk/Pro...astic-sealants

    Either way I never use anything that threatens to work like a glue.

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