01/04/2019 at 10:29 pm #28943
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.
Ian02/04/2019 at 9:32 pm #28954
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;02/04/2019 at 9:45 pm #28956
I can recommend Wonder Wipes (Toolstation sell them), for getting rid of unwanted Sikaflex….it is very sticky stuff and tends to get everywhere!02/04/2019 at 11:09 pm #28959
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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