black pudding

M

monkey_trousers

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bf494.co.uk
had anyone any experience of this stuff? The goo not the yummy sausage made from the blood of dead things!

planning a lift out and recaulk below the waterline soon, and don't think we'll be out long enough for the timbers to thoroughly dry and this sounds a reasonable compound for less than perfect seams
its listed on:
http://www.tradboats.com/conseamfillers.html
 
I,ve tried it and it works, just. I did,nt find it very satisfactory and messy. I used it as an emergency repair. But I would have thought red lead putty would be better if you are doing a lot.
 
There are various traditional home-made concoctions. Stockholm tar thickened with cement I think is one. I find B&Q non-hardening black gutter sealant pretty good for deck seams.
 
cliffordpope said:
There are various traditional home-made concoctions. Stockholm tar thickened with cement I think is one. I find B&Q non-hardening black gutter sealant pretty good for deck seams.
Click to expand...

I'm sure you mean underwater seams? surely non hardening gutter sealant would make a mess on the deck.

Personally I would use red lead putty underwater from the same place. (Traditional boat supplies)

Tom

PS I use (gutter sealant) it for sealing behind trim, only found it this year so not sure of it yet! But so far so good, never thought of underwater seams.
 
I did buy the premixed stuff from Trad Sups. It was fine, but he does put a secret additive in the mix to keep it soft-I think soap. Nothing wrong with that its just on some boats which have come out six months later the P washer hoiks it out again.
For a 5 kg tub I just mix my own. Add enough lead powder to make it a pale pink colour, not bright orange. Add linseed to make it sticky again. Not sure of the %. Just warm up a handfull, lay it our like a pastry, sprinkle on a thin layer then roll it up like a swiss roll. Work it untill mixed, repeat with powder and oil untill just right.
 
Seanick said:
I did buy the premixed stuff from Trad Sups. It was fine, but he does put a secret additive in the mix to keep it soft-I think soap. Nothing wrong with that its just on some boats which have come out six months later the P washer hoiks it out again.
For a 5 kg tub I just mix my own. Add enough lead powder to make it a pale pink colour, not bright orange. Add linseed to make it sticky again. Not sure of the %. Just warm up a handfull, lay it our like a pastry, sprinkle on a thin layer then roll it up like a swiss roll. Work it untill mixed, repeat with powder and oil untill just right.
Click to expand...

I think you'll find that the 'secret' ingredient is grease. At least that's what John at Trad supplies told me some years ago.
 
Seaware (of Penryn) supply their red lead materials with a "recipe" taken from Claud Worth:

Mix sufficient red lead powder with raw linseed oil putty, to turn it pale pink.

Add white lead paste (one teaspoon per kilo of putty).

Mix thoroughly and apply to seams.

The red lead sets the putty hard, whilst the white lead is the binder.


My experience is that "pale pink" stopping takes a very long time (weeks, even months) to set hard and be sandable. Bright orange pink sets in a few days, and is then as good as epoxy (am I allowed to mention epoxy?), and sands well. This has not dropped out yet!


If it feels too dry and does not go in smoothly I then add raw linseed oil to taste, though I am told engine oil or grease is okay too, or even add a bit more white lead paste, which appears to do no harm.

I now look forward to being told how wrong I am!
 
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