Which "Sikaflex" to use for sealing buoyancy tank leaks?

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This topic contains 3 replies, has 3 voices, and was last updated by  patty 3 weeks ago.

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  • #28943

    patty
    Participant

    My first post here follows on from my first buoyancy test (carried out by Andy Rigby) whilst at the excellent Wayfarer Cruising Conference last weekend.

    My Mark 2 front tank passed, but my rear tank was a failure!  Andy’s advice was to seal the gaps (between the hull and the deck) with Sikaflex, which I duly scribbled down on my notepad.

    I have done some searching on the internet for a supplier but have discovered numerous varieties of Sikaflex.  I figure that the one I need comes under the ‘leisure marine’ category, but there are two types, viz. ‘sealing’ (Sikaflex-291i ) or ‘bonding’ (Sikaflex-292i).  I am unsure which one I need to buy for the job and would appreciate some advice please.

    A photo of the product or a link to (say) Screwfix’s website would be good if the 291 ID’s (from SIKA’s website) don’t ring any bells.

    Many thanks

    IanBuoyancy Test

    #28954

    Bob Harland
    Participant

    Hi, I think it would be 291i you are looking for, a flexible sealant rather than an adhesive.

    I would also try to find where your leak is first – rather than just sealing any gaps and hoping the problem is addressed. Or is there an obvious damaged area? And I guess the hatch cover has a good seal – that’s often the culprit?
    To be effective the sikaflex will need to be forced into the gaps creating the leak.

    There are a couple of posts here that should help;

    https://wayfarer.org.uk/forum/topic/buoyancy-tests-and-smoke-pellets/

    https://wayfarer.org.uk/forum/topic/help-leaking-buoyancy-compartment-front/

     

    #28956

    Porttackflyer
    Participant

    I can recommend Wonder Wipes (Toolstation sell them), for getting rid of unwanted Sikaflex….it is very sticky stuff and tends to get everywhere!

    #28959

    patty
    Participant

    Thank you Bob and Portackflyer.  Both on my shopping list now 🙂  I had wondered about the bonding/adhesive option initially as that had been described for use between hull and deck, so I guess because that joint is pretty static at present, the flexible filler is the better option.

    The smoke test indicated leaks and a distinctive hissing noise where the deck meets the strips below where the cut-outs for handling the boat are located, so I’ll be doing a close visual check and drying the suspected areas out before having a go at filling in.  The seal round the tank cover does seem to be sound as do the holes where the bolts on my outboard bracket pass through the transom.

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