claeyssens
2021-12-06T21:00:21Z
Hello
I have a leak from the port U-bolt. The water goes into the chart table. Since 5 years, I have taken off 3 times the U-bolt and I have put on with Sikaflex sealant.That is waterproof for the summer, but 6 months later, the water comes again .
I have heard about Butyl , rubber based sealant ( arbomast br but not available in France). Have you an experience with this sealant for the U-bolt plate.
Thanks for the answers.
Best regards
Pascal Claeyssens
Maruli P325/27
barry.tiernan
2021-12-07T11:42:08Z
Hi Pascal

Are you talking about the chain plate for holding the shrouds. (u-bolt??)

Regards

Barry Tiernan

Sulito 39
Poole

claeyssens
2021-12-07T13:54:13Z
Hi Barry,
Thanks for your answer. It is for the chain plate for holding shrouds upon the deck. I have found the word U bolt in a dictionary, but I suppose it isn't a good one.
Best regards
Pascal ( from French Britanny)
barry.tiernan
2021-12-07T14:23:31Z
Hi Pascal

I have the same problem. I started a thread about chainplates in October this year and this is a common problem

The design is an issue as the cover is welded and part of the chainplate. So if there is any movement of the chainplate the cover lifts from the deck and allows water to seep in to the bulkhead/chart table.

In my case the holes in the bulkhead have elongated and pulled up a few mm which shows as a gap on the chainplate cover. If you look at the pictures from my posts on chainplate problems you will see,

I have just made stainless sleeves to go into the bulkhead. When the wind is light I will remove the chainplate and re-bore the holes. I will resin in the stainless steel sleeves. I will then get the chainplate back down flush with the deck.

I suspect that there will continue to be a pull on the chainplate cover from...

1. The angle of the shrouds pulling up
2. In hot weather the mast will expand greater than the shrouds and this will probably try to pull the chainplate up again

Unfortunately as the chainplate cover is welded to the chainplate it is hard to keep this flush with the deck.
I will use a flexible marine sealant as hard glues as Sikaflex will just crack. I suspect if you try to blot the chainplate down to the deck, the upward pull could crack the deck, not a good idea

I will send photos when I complete the work
Although given the angle of the shrouds to the chainplate I suspect this will be an ongoing issue and will need regular topping up with sealant.

A lot of other members have the same problem

Nice to talk to you

Regards

Barry Tiernan
Sulito 39
claeyssens
2021-12-07T15:15:59Z
thank for this answer
there are four screws to join the plate to the deck,but ,of course they move also. The Boat will be ashore for the winter next week. I will take off the chain plate again with the mainsail halyard hooked on the toes rails. And I will try to do that you have done with an epoxy filler but I must wait the spring to have a good temperature. Now our boat is 25 years old.
Best regards
Pascal
Maruli P325/27
MartinH
2021-12-07T18:56:59Z
Hi Pascal

When we took one chainplate out out of our boat because it was leaking, we found that the slot in the deck was much bigger than it needed to be.
Filling this slot with epoxy filler so that there was just room for the chainplate to go through left a much bigger area under the deck plate to apply a sealant. We used Arbokol 1000 as a sealant and it is still fine two years later.

Martin
P335/50 Tringa
claeyssens
2021-12-08T11:46:36Z
Many thanks for your good advices.
Pascal
Tim Reeder
2021-12-13T21:41:07Z
Hi Pascal
I have had a similar problem with my 275 shroud plate. I tried many sealants including Sikaflex etc over the years. I have found that just digging out the sealant around the plate and replacing with very cheap bathroom sealant works well for a couple of years. A very inexpensive and effective solution.

Bon chance

Tim Reeder
claeyssens
2021-12-15T19:52:17Z
Hi Tim,
Thanks for your help. Somebody tell me about car windows sealant, but I think that will stick too hard the deck and the deck will work upway badly.
I shall try the butyl sealant and I shall look the bulkhead holes. Maybe I will have to fill the holes with an epoxy sealant and will drll new holes 2 or 3 mm more lower.
Sorry for my poor English language.
Best regards
Pascal
Maruli P325/27