Stus-List Re: Coal tar bottom paint removal?

[Rick Brass via CnC-List]

At one time (like 25 years ago) you would see something like black tar as a bottom paint on wooden boats - I associate it with fishing trawlers. I always thought it had creosote or some such in it as a preservative in addition to sealant and antifouling. IIRC it was nasty to work with.

Rick Brass

-----Original Message-----
From: Matthew via CnC-List
Sent: Apr 5, 2021 9:54 AM
To: 'Stus-List'
Cc: Matthew
Subject: Stus-List Re: Coal tar bottom paint removal?

I don’t know about “coal tar” per se, but as the name suggests it is probably a thick, gooey black substance you could apply to the bottom as a barrier coat.  VC used to make a product called VC Tar.  I used it once and found it too difficult to work with.  Go with regular barrier coat, like Interprotect 2000 (or whatever name/number it goes by now).

 

From: David Risch via CnC-List <cnc-list@cnc-list.com>
Sent: Monday, April 05, 2021 8:27 AM
To: Stus-List <cnc-list@cnc-list.com>
Cc: David Risch <davidrisc...@msn.com>
Subject: Stus-List Re: Coal tar bottom paint removal?

 

I am having a hard time wrapping my head around a "coal tar bottom paint".   Never heard of it.

Sent from my Android. Please forgive typos. Thank you.

 

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From: Bill Coleman via CnC-List <cnc-list@cnc-list.com>
Sent: Sunday, April 4, 2021 2:23:58 PM
To: Stus-List <cnc-list@cnc-list.com>
Cc: Bill Coleman <colt...@gmail.com>
Subject: Stus-List Re: Coal tar bottom paint removal?

 

A friend of mine was working on a sewage treatment project once. He had to repaint some steel tanks that were coated with coal tar. He said he tried in vain to sandblast it, but it wouldn't touch it. So I said, why are you even trying to remove it if it's on there that good? It doesn't seem like you could do any better than that. But apparently that's what they wanted for some reason

Bill

 

On Sun, Apr 4, 2021, 1:25 PM Dave S via CnC-List <cnc-list@cnc-list.com> wrote:

Funny stuff - clogs sanding/grinding discs then burns.... which kinda works.     acetone does dissolve it but it’s not a practical approach.   The stuff is cracking and appears to be drying on the surface, though is rubbery when removing.   - have been painting anti fouling over it but I expect I’ll need to renew before long.

Any suggestions as to how to remove?

Thanks, Dave



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Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu