Calcious deposit. :-)

[Bobbybass]

Hi all.

 

Just put my recently acquired boat into dry dock for blacking. It's spent it's life ( 17 years) on the K&A..which is very chalky. It's been pressure washed off..and is still covered with a thin natural chalk deposit which is like concrete. I'm lead to believe this is typical for this area.The boat yard ( who have no interest in telling me this was the case if it wasn't ) have been reassuring.

 

The anodes haven't been changed for 8 years but are still serviceable..so reinforce what I'm being told, that the nature of the water leads to little corrosion.

 

I attended as I was keen to see the condition of the base plate but short of taking a chisel to it...there is no way to do this. Even the prop has got a light  coat of chalk. Certainly the pressure washer had no impact. 

 

I've told myself that all is well under these circumstances.

 

Do you think I'm right to conclude that?.

[BEngo]

Similar happens around the GU Tring summit.  I usually descale the prop with a small angel grinder and used to go along the waterline with a big begger.   Since it was epoxied the chalky deposit comes off with a good  pressure washer.

 

You could thin the first coat of  blacking so it soaks into the 'concrete' but unless the black is really thick stuff I'd not worry.

 

N

[Stilllearning]

Definitely leave it as a protective coating. We need a chemist to come along and explain the whys and wherefores.

[bizzard]

Too much urinating in the canal will  cause it as well.

Edited January 14, 2019 by bizzard

[Bobbybass]

2 hours ago, bizzard said:

Too much urinating in the canal will  cause it as well.

Are you taking the p**s ?..     :-)

[Phil Ambrose]

We get the same deposit on the river Lark which is a "chalk stream".

Phil

[Boater Sam]

Take out into salty water for a week.

[TheBiscuits]

5 minutes ago, Boater Sam said:

Take out into salty water for a week.

There is a reason why we are booked into Liverpool shortly before we are booked into Wigan dry dock this year!