6 meter sailboat

by Fred
(Michigan)

I have an old classic boat built in 1947.

This is a wooden boat and at some point someone covered the boat with fiberglass.

I am stripping the fiberglass because of moisture and replacing part of the stem.

As I have removed some of the planks I noticed there is no cotton caulking, only putty.

I do not plan to replace the fiberglass but rather paint and seal.

My question is, if there is no cotton between the planks is the putty alone going to keep the water out?

It seems either I have to remove the putty and caulk with cotton and putty or I have to replace the fiberglass?

Do I have to caulk only below the water line or the whole boat?

Fred




Comments for 6 meter sailboat

Click here to add your own comments

Caulking
by: Anonymous

Thanks for your recommendations.

cotton caulking
by: Anonymous

Sorry Hugo, but you are way of the mark suggesting that he does not use cotton.

Hemp is only really useable in thicker planks.

On a smaller hull like this the only option is cotton.

If you have experienced discoloured cotton it is because of the cotton being contaminated some other way.

Currently working on a twenty four foot wooden yacht with seams which are definitely thirty plus years old and the cotton is pure white.

Anything thicker than a one eighth seam I would consider hemp, anything less absolutely not.

Caulking
by: Anonymous

Thank you again for sharing your knowledge about the care of these boats

Fred

cotton caulking
by: Anonymous

The cotton serves another very important purpose other than keeping out water.

It serves to stiffen the planking and prevent sawing, the action where the planks move against one another when the boat heels.

Cotton and putty or sikkaflex and cotton, but either way don't be tempted to leave out the cotton.

A sheathe of fibreglass would have stiffened to an extent but doing such a thing shows a grave contempt for the boat and a lack of understanding of timber.

Caulking
by: Anonymous

Thank you for your feedback . I will follow your advice .
Fred

Caulking
by: Dr Hugo

Hi Fred,

Proper caulking below the waterline is essential.

It is much better to use hemp/jute/oakum than cotton that rots, turns black and stinks in time if there is seepage.

Hemp or jute is easier to work with, twisting and tightening and paying into the seams strongly with a caulking iron leaving an adequate groove for the sealant.

For sealant, marine Sikaflex is very good, the black one being easier to sand when dry than the white one.

Once applied, it can be smoothed while still soft by rubbing over gently with your finger with a little kerosene for an even finish with little or no sanding needed.

The 3M caulking compound, also in a tube to be used with a caulking gun is also good but more expensive.

Later when dry, just wipe down with thinners or acetone before painting with primer and top coat.

Caulking above the waterline is usually not necessary but clean all seams thoroughly by scraping, vacuuming and brushing with thinners or acetone to ensure good adhesion for the sealant.

Hope this helps.
Cheers!
Hugo


Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Wooden Boat Projects...


If you wish to add more photos (or videos) to your post or if you have any problems loading photos use the link below (there is no need to resize or adjust your photos).

But please use the 'Description Box' to indicate to which post the photos belong.

Click Here to securely send your photos,




Creative Commons Licence
This work is licensed under a Creative Commons Attribution-ShareAlike 2.0 UK: England & Wales License.

I am perfectly aware that the majority of Wooden Boat aficionados are sensible folk.
However, I need to point out that I am an amateur wooden boat enthusiast simply writing in order to try to help other amateur wooden boat enthusiasts.
And while I take every care to ensure that the information in DIY Wood Boat.com is correct, anyone acting on the information on this website does so at their own risk.