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Leaky Laser

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JimC View Drop Down
Really should get out more
Really should get out more
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Joined: 17 May 04
Location: United Kingdom
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Posts: 6364
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 08 at 8:52am
Originally posted by Merlinboy

In my experience though polyester resin works best

Polyester isn't really an adhesive though, so will never be great either. I don't know what the big shops use, maybe something like sikaflex.
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cbcblaze View Drop Down
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Joined: 11 May 08
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Post Options Post Options   Quote cbcblaze Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 08 at 9:46pm

Ok - here's the outcome of what happened....

The crack in the joint had opened up wide enough to allow me to get in with a grinding tool on my Dremel. I used two different sizes - the tool looks like a wee ball on the end of a stick and it carved it's way nice and cleanly through the joint without ever straying from the crack. I cut down to about 8mm depth in most places - less if the material seemed strong, and right through to thin air if weaker or crumbly.

I mixed polyester resin with colloidal silica powder until it had a paste consistency rather than liquid. Hopefully the filler will give it some resilience and less brittleness. One side of the boat had a 2mm gap to fill but the worst bit on the other side had opened up to 4-5mm. I filled it proud of the surface then sanded it back flat the next day. I was going to reinforce the wider gap with a couple of layers of tape and resin but it seems to be a strong enough join. Once on the water I may be proved wrong - as someone pointed out, the forces are strong when capsized or in waves. If it opens up again, I'll repeat the filling but will add the tape.

water trials this weekend...

cheers,  Angus....

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cbcblaze View Drop Down
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Post Options Post Options   Quote cbcblaze Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jun 08 at 9:00pm

latest news -

this is turning into a blog but , hey it may be useful to someone:

The first repair didn't last, it split in a force 3-4 in waves - too much flex and stress. Not one to give up , I took things to the next stage which is pretty drastic - rapair crack again, then drill 5mm holes at 10 cm intervals and rivet. then fair the rivet ends with epoxy filler and cover the whole with fibreglass tape and resin. In my garage the repair looks strong but only time will tell. 

Next test on the water is Saturday - this must work !!  otherwise the scrappy beckons....

 

 

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