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Old 15 June 2016, 10:05   #1
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The Gurnard fixes a leak in an awkward spot...

[Admin note: these posts have been moved here from this thread: http://www.rib.net/forum/inlinemod.php?threadid=72466 which explains how The Gurnard acquired the leak in the first place!]


Ach ..the midges were only around for about an hour Jeff. I generally wake at 5 am every summer morning so that is why I met one or two then..by the time the rest arose..a wee breeze kept them away.

I had no midge bites when I got home..but I did have a wee tick..just behind my knee. Those are wee buggers too.

Just for info..particularly to you Jeff as you have the same SIB ..just a tad shorter. Here is the leak. As I suspected..its chaffing from the angled edge of the rear floor trim. It was very rough the day I used her before the SIB outing.. so probably that was the final straw after twelve years of rubbing on the floor. An easy sort though..and I suspect the tear at the back edge was due to the rough with a flat tube as I didn’t see it when I had the floor out during the winter.

Keep an eye on that area on your SIB too ..perhaps pad the edge of the floor with plastic tape to help. Wear and tear after 12 years is only to be expected.. especially if you push them the way I do

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Old 15 June 2016, 11:20   #2
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thanks for the tip gurnard i have seen this on other boats as you say its to be expected two surfaces rubbing sand , salt in between and twelve years of it, i think end of season i will buy some neoprene tape, i have used it on my bow dodger to prevent chafing its not expensive sticky on one side various widths and thicknesses got it off eBay for info.
since you have it stripped out is there any other areas that are as bad or is it just at the stern i have only seen it in that area possibly because of the engine forces at that point.

cheers
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Old 15 June 2016, 11:44   #3
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I have only removed the last panel so far Jeff.. Im leaving it with the boat cover on for a few days so it all dries out.. then I will investigate further and do the repairs.

The other side is going in the same place..but not quite through the black PVC layer to the red PVC tube..so some padding will sort that side out. This photo shows the angled edge that has done the chaffing



This is a closer view of the leak..its a sizable hole in the red PVC tube. The black PVC layer is well glued and is not lifting.. so my plan for the permanent repair is to clean it all up .. then make a mix of sikaflex and PVC glue ..to plug the hole and make the plug flush with the outside of the black PVC layer. Once its cured off .. Two part PVC glue a big patch over the plug and black PVC..if that makes sense. Whadda ya think ?

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Old 15 June 2016, 13:44   #4
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Originally Posted by The Gurnard View Post
I have only removed the last panel so far Jeff.. Im leaving it with the boat cover on for a few days so it all dries out.. then I will investigate further and do the repairs.

The other side is going in the same place..but not quite through the black PVC layer to the red PVC tube..so some padding will sort that side out. This photo shows the angled edge that has done the chaffing



This is a closer view of the leak..its a sizable hole in the red PVC tube. The black PVC layer is well glued and is not lifting.. so my plan for the permanent repair is to clean it all up .. then make a mix of sikaflex and PVC glue ..to plug the hole and make the plug flush with the outside of the black PVC layer. Once its cured off .. Two part PVC glue a big patch over the plug and black PVC..if that makes sense. Whadda ya think ?

In some respects it's a difficult one as the surrounding material is still ok and plugging the hole will do the job but if it were me I would go to a tyre repair shop and buy a mushroom repair insert if they have one small enough or one of the self bailer mushrooms push through the hole with glue on it pull tight back to the tube and inflate the tube wait till it dries then cut the stork level and do an external patch even sikaflex on the mushroom will do it and give you more time than glue.
Put some string round the mushroom stalk and tie it back to keep pressure on wont do any harm till it sets. Also the mushroom stalk has a ridge on it which will help.
Just thought an old mushroom off a fuel pump is very small which would be easer to get through the hole.
Farm machinery supply shops sell mushrooms to
Cheers
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Old 15 June 2016, 13:53   #5
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>>> before returning to Largs...and home.

Interestingly Largs (well Fairlie) was my home a while ago... I say a while... actually 1957 when I was one. Fenlander snr was a construction engineer on the... not totally popular at the time... Hunterston A nuclear power station opposite Little Cumbrae. It was his stories of escapades on leaky hired puffers with iffy engines that prompted my interest in returning north of the border as an adult.. as we have done each year since for most of the past 35+ years.

>>>make a mix of sikaflex and PVC glue ..to plug the hole and make the plug flush with the outside of the black PVC layer. Once its cured off .. Two part PVC glue a big patch over the plug and black PVC..if that makes sense. Whadda ya think ?


Yes or an alternative would be to slit that exposed red PVC each side from the hole giving just enough room to get in some glue and a folded small inner patch... fiddly but just possible and perhaps too invasive??
What do you think to my mushroom method David you have done more repairs than me ,same as mending a car tyre if he uses sika flex it would stick on in its own write if the mushroom drops off.
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Old 15 June 2016, 13:55   #6
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Hey Jeff..I must have been keeping myself in the dark and feeding myself a lot of sh&!

I love your 'shroom idea.. and will do that first..followed by sikaflex PVC glue filler mix.. to build up to outside level of Black PVC. Then slap a patch over the lot which should help it reoccuring

Thanks for that
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Old 15 June 2016, 14:08   #7
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Hey Jeff..I must have been keeping myself in the dark and feeding myself a lot of sh&!

I love your 'shroom idea.. and will do that first..followed by sikaflex PVC glue filler mix.. to build up to outside level of Black PVC. Then slap a patch over the lot which should help it reoccuring

Thanks for that
The car repair stalk has a metal rod which will aid pushing it through so you could make a folded umbrella shape full of sikaflex if that makes sense so kind of push through half way fill with sika push the rest of the way mushroom will open pull back. Hope it works because it would be a good repair for awkward places like yours.

Cheers
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Old 15 June 2016, 14:21   #8
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Yep that's the best idea yet Jeff! Something where pressure pushes the inner repair into place has great merit.
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Old 15 June 2016, 14:35   #9
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Im going to steal a little of both your and Fenlander’s suggestions Jeff.

I cut two small PVC patch material circles. Drilled two tiny holes in one of the disk patches.. threaded fishing gut through the holes..then glued the other disk on the back so it seals the holes. Once Im ready ..warm this mushroom patch up..make the hole in the boat slightly larger... slobber the mushroom patch with glue..shove through the hole..then pull it up tight to the inside of the tube with the fishing gut.

Once it has set in position.. cut the gut flush..fill with sikaflex.. to level of black PVC then the external patch over the lot. That should sort it ..no problem..and jobs a done deal

Three minds working together .. are better than one gurnard fish head

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Old 15 June 2016, 15:14   #10
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Great idea and done in a jiff could also be done in the field as part of the repair kit.
As a suggestion I would say if it's wet in side? Sika /marine flex will set with a damp surface or use a moisture reacting glue such as gorilla glue.
And make the hole round to stop it travelling same as they do with cracks in steel by drilling a hole to stop it running on.
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