SV LIMA Projects

All our projects of SV LIMA.

There are many more project details in our SV LIMA premium area.

Rust is no option on a vessel - never.

Whenever something is made of metal and it is being in touch with water there is a risk of rust. We do not want rust! Our keel is made of iron and we do have to fix the rusty seam of our keel that is no longer fully sealed against the sea water SV LIMA is in.

So we have to deal with it.

 

 

The theory

What is a keel seam, why does a vessel have it and what is it all about?

A sailing vessel usually has a keel to lower the center of mass and to make proper sailing possible in generally. A keel is substantial part of the lateral plan of a vessel. But we do not want do dig to deep in this discussion. On SV LIMA we have a keel made of cast iron. And of course our keel is under water. That is the nature of a keel of a boat. SV LIMA has a wing keel which is pretty nice since we have a very good draft (less than 2m along with a 120m2 sail area which is fine for us). The winged keel is why our vessel has the prefix Contest 46S which is a specialised version of the boat.

 

SV LIMA on a dry-dock from portside.

 

The wing keel is connected to the hull with bolts. Due to this kind of construction - which is typically for sailing vessels - there is a seam. This seam has to be sealed. As there are always very minor movements the seam can not just be laminated with a hard compound like per example fiberglass mats and epoxy. This combination would break during movements. The seam would get in contact with water and start with the rust. This needs to be prevented.

 

Keel of SV LIMA on dry-dock. View from portside. Good view on the wings as well.

 

Keel seam from below with rust before newly sealing the seam.

 

 

The material of choice for sealing an underwater seam is a so called MS-Polymer

What is MS/MP Polymer? 

There are many names for the material: MP polymer, SMP (Silyl-modified polymers), silane-modified polymers, modified-silane polymers,...

MS polymers are polymers that have a silane ending (chemically spoken).

Products with MP polymers are

  • isocyanates (basis for polyurethane)
  • free of dissolvers (keeps it a little flexible)
  • used for sealing
  • used for adherence
  • with good UV resistance
  • with good temperature resistance

 

What are common products and which want of them do we use?

Most common in nautical environments people know products like e.g.

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

The project

 

The project itself is currently in planning status. So we are currently working on the planning, purchasing, execution and the wrap up. All this is documented in detail and provided to you here shortly. 

 

The purchase

As usual we checked the internet. The 1-K Power Bond as mentioned in the products are is at the point in time where we purchased it at a provider called Industrieware.de

 

Dimension: The big question was: "How much of the MP Polymer do we need"? So what we only did is to do some kind of rule-of-thumb thing: We said we do have around 4-5m of seam length. So 1 cartridge should be fine to be safe. To be fully safe we then went with 6 cartridges.

 

Our purchase was: 

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

In total we paid:

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

For comparison:

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

 

Prerequisite

Prerequisit was to get access to the seam without destroying the underwater protection. So aligned the sealing of the seam with the rebuild of the underwater body. After getting rid of the old antifouling we were able to start with this project.

Scraping the antifouling away from the hull is also a bunch of work. But this is not part of this story here...

 

The project execution

In the end the project is not a big deal. You just have to work as concentrated as possible.

Following steps have to be done:

  1. Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

1. Remove old sealing

This step is a pain in the ass. You think you can simply take your chisel and a hammer and put the old sealing out. But forget about it. Perhaps you know it from home from trying to remove silicone (btw: Never use silicone on a boat - never!).

This step took us 90 minutes for that small area removed. And we only removed the rusty are plus 10cm on each side in addition. 

 

2. ????

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

3. Tape the area

Tape everything around the sanded are. The new sealing has tremendous adhesive power. So prevent to apply the sealing anywhere else on the hull where you do not want to have it. Check twice to make sure the tape is properly put on the hull.

Time effort: 5 minutes.

 

4. ???

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

The video

Note: You can find this detail of the project fully detailed in SV LIMA premium area. Provide us with a beer and you get access for a full year. Get more info. (If you are already premium user you can reach premium area via top level menu "SV LIMA - Premium". This is only visible if you are premium user)

 

 

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