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Little black marks

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iansmithofotley View Drop Down
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Post Options Post Options   Quote iansmithofotley Quote  Post ReplyReply Direct Link To This Post Topic: Little black marks
    Posted: 03 Apr 05 at 8:48pm

Hi nixy30633,

Personally, I would brush on the solution of crystals and water and let it dry out.  If after a few days, the black marks are still there, then I would repeat the procedure, as many times as necessary, until you are satisfied with the result. Once you are happy with the job, then you should use the neutralising spirit and leave it to dry out again.  I suppose that there will be some marks which will never come out no matter how many times you repeat the procedure, it just depends how bad they are. I am not an expert on this subject but I once refurbished a wooden Enterprise and the method worked for me.

Ian  (Yorkshire Dales S.C.)

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Post Options Post Options   Quote nixy30633 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Apr 05 at 12:42pm
hi, i need to clean up the black marks on my boat. i have the oxalic acid crystals, but when you put it on the boat do you just leave until it has dried out and then neutralise with meths or another spirit.
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Post Options Post Options   Quote neilw Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 05 at 11:35pm

 

You should be OK with 4:1, best to trial on a non-obvious place

There are also commercial products that contain oxalic acid, but are "safe" to use.

I have used Net-rol in the past and there's info on another product,TBS, over on the Classic and Vintage Racing Dinghy Association's forum. This link should take you to the relevant thread



Edited by neilw
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KnightMare View Drop Down
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Post Options Post Options   Quote KnightMare Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 05 at 9:18pm

yeah Buzz it has now been classed as a top class poison (or some thing like that) so i had to get my dad to go and collect it from the very nice chemists shop that ordered it in for me.

My next problem is that since i have a pot of this stuff what concentration should i mix? Any advice on this bit?

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stuarthop View Drop Down
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Post Options Post Options   Quote stuarthop Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 05 at 4:27pm
my scorps epoxy coated and it worked fine thanks guys.

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Post Options Post Options   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 05 at 10:54am

Oxalic acid is a well known bleaching agent. I have used it on Firefly's and it works well.

Be careful it is poisonous if swallowed and is a severe irritant if inhaled or absorbed through the skin.

The link below gives a detailed description and precautions.

 http://www.jtbaker.com/msds/englishhtml/o6044.htm

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Post Options Post Options   Quote StephenSails Quote  Post ReplyReply Direct Link To This Post Posted: 29 Mar 05 at 9:49pm

Originally posted by bigwavedave

Thats the stuff oxalic acid, and I think he then used white spirit or maybe turps.

 

Its good stuff, mix it warm water and be careful as its quite bad for you!

 

 

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http://www.yachtinguniverse.com [/URL]
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Lucy Lee View Drop Down
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Post Options Post Options   Quote Lucy Lee Quote  Post ReplyReply Direct Link To This Post Posted: 29 Mar 05 at 10:05am
Yes, epoxy can be sanded, but it will be harder than sanding varnish (start with reasonable coarse grit sandpaper). I don't know it there are potential interactions between epoxy & turps etc so it would be worth testing that out first.
Fly Cherub!
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KnightMare View Drop Down
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Post Options Post Options   Quote KnightMare Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 05 at 7:06pm

Yeah I have a similar problem on my sisters boat but the boat is epoxyed instead of varnished can i this just be sanded back in the same way or not?

All of these black bits have been caused by chips in the epoxy. I just want to remove the colour before covering them up, do i just do the same as was advised for stuart.

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stuarthop View Drop Down
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Post Options Post Options   Quote stuarthop Quote  Post ReplyReply Direct Link To This Post Posted: 24 Feb 05 at 9:53pm

k thanks for the help guys i'll try all that 2moro

 


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