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The Norfolk Broads Forum / Broads Boat Owners Q & A / Tar Varnish
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Posted By Discussion Topic: Tar Varnish

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waif
Dec-31-2005 @ 2:23 PM                           Permalink
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Apart from the obvious way (scraper and elbow grease) any ideas on the best way of getting tar varnish off the hull. i have just spent a lovely morning under Waif happily getting the stuff off, and hav managed about 3'.

any help will be greatly appreciated.

I'd rather be sailing

Dibbler
Dec-31-2005 @ 2:25 PM                           Permalink
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Ouch...thankless task. Personally, no idea...Your best bet would be to ask Bill Maxted...if he doesn't know, he'll most likely know someone who does.



John

billmaxted
Dec-31-2005 @ 2:30 PM                           Permalink
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You called just about to go off duty Evil Grin

A Happy New Year's Boating to all forum members  Bill...

billmaxted
Dec-31-2005 @ 2:35 PM                           Permalink
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Why do you want to take it off? Reactivate with a coat of ceososote and then after 24 hours apply a new coat of black tar varnish over the top. If necessary leave another 24 - 48 hours and apply a second coat may need longer under present conditions if not in a heated shed. Heavy scrubbing with lots of white spirit will get most of it off but you will have a hell of a mess. Smile

A Happy New Year's Boating to all forum members  Bill...

This message was edited by billmaxted on Dec-31-05 @ 1:36 PM

Deano
Dec-31-2005 @ 4:45 PM                           Permalink
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Hi
Forgive my ignorance, but you now have me interested.

What is Black Tar Varnish??

Dean.
PS Happy New Year

Paul
Dec-31-2005 @ 10:00 PM                           Permalink
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I expect Bill will be able to give you his professional description and opinions in the morning, but to answer the question for now, Black Tar Varnish is a very cheap substance that many/most hire boats were/are coated with below the waterline. It's probably no good for salt water, but in the Broads environment, it seems to last forever. It doesn't flake off, and I believe it gives good protection to the hull (GF or wood). As Waif's owner has found out, it's very difficult to remove, needing to be disolved with a solvent, even after being on for years.

It's very messy and smelly to apply, so is often not used right up to the waterline, as this photo of my Hampton shows. I used Blakes 'Broads' blue antifouling to 6" below the waterline, then tar varnish below that.

The 2.5 litre tin of Blakes AF cost about £50, and the two 5 litre tins of tar varnish cost £8 each !

One slight drawback though, when I scrubbed her last year, there was a very extensive growth of freshwater mussels on the tar varnish, but not the antifouling, although that may be due to difference in the immersion depth...   Smile


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billmaxted
Jan-01-2006 @ 9:48 AM                           Permalink
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Well Black tar varnish is a bituminous Black 'paint' don't ask me to get more technical than that, because the most common brands including 'Swallow' were reformulated about 18 months ago to remove the Coal tar element.  The manufacturers found a good weeze to inprove their profit margins by making the new stuff a lot more runny. This ensures that a higher proportion of their product goes up your sleaves and soaks through your overalls than it did before. It does however ensure that if going slightly grey if you work with under a boat you will never have to worry about Grecian 2000.

As already mentioned it can be softened and then 'patched' and a new cover put on over the top. Normally a good pressure wash will get off all that is necessary and any slight scaleing will just merge into the new layer. Like paul I just do the bottom with the boottops antifouled. Unlike paul this year I have actually found that weed growth on the BTV was less than on the Blakes antifoul.

I'm sure someone will say it is unfriendly but at least you don't have toxic scrapings everywhere. It is the natural successor to the pitch used on Wherries the only way to get that off was with burning tourches of close packed reeds ( Evil Grin  This is not a technique recommended to forum members  Evil Grin  )

A Happy New Year's Boating to all forum members  Bill...

This message was edited by billmaxted on Jan-1-06 @ 8:50 AM

Deano
Jan-02-2006 @ 1:26 AM                           Permalink
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Is this the same stuff that narrowboaters refer to as
'Black' or 'Bottom Blacking'?

I seem to be lucky, my boat has been in for 2 seasons,
out for the winter.  Was only antifouled once with
some cheep stuff and has no growth at all.  Even on
the patches where she was sat on blocks when I did the
antifoul.
As she is 40 years old, I suspect there may be some
old antifoul at work several layers down???


Dean
Freeman 22 1966...... Watch
out Norfolk we are comming in
2006.

billmaxted
Jan-02-2006 @ 8:22 AM                           Permalink
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There are various kind of 'Black' including proper Black Bitumious Paint and International's VC black which is very expensive but does provide good protection for boats with a bit of osmosis

A Happy New Year's Boating to all forum members  Bill...

waif
Jan-02-2006 @ 1:28 PM                           Permalink
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The reason i am undertaking this thankless task is that I have been advised that anti fouling is better for the wood than the tar varnish. having already started I will carry on removing it. still it beats going to the gym!  Smile

Happy new year to all

I'd rather be sailing

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