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Little black marks

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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 Topic: Little black marks
    Posted: 23 Feb 05 at 2:25pm
There are a few small black marks under the varnish of my scorp and i would like toget rid off them, a freind told me that you can just sand them away but another told me theycan come back if you do this. does any one know how I can sort this problem?

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bigwavedave View Drop Down
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Post Options Post Options   Quote bigwavedave Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 05 at 5:51pm

Get a plastic boat, paint it not varnish.

It depends on what the marks are.  If they are damp spots try the following.  I remember my Dad doing it to a Firefly a long time ago.

Get the varnish off and make sure the timber is very dry. If they don't go with a little light sanding then you may be able to bleach them out. But make sure you try on a hidden area first cause you might get a bad reaction. Can't remember what he used at the time but I'm sure a chandlers would be able to put you in the right direction.

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Post Options Post Options   Quote iansmithofotley Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 05 at 8:26pm

Hi Stuart,

You could try masking off, sanding back, drying out, solution of oxalic acid crystals (from chemist shop) and water, dry out and leave, clean up with meths or other spirit to neutralise, dry out, fine sand, epoxy, fine sand, multi varnish job.

If you can get to the under side of the job, it is worth checking that the damp is not working its way to the top side from the under side, if it is, sand back dryout, epoxy and paint/varnish job. It's a good idea to find out what caused the problem in the first place, if the problem is due to flexing, some beefing up may be required.

Ian   (Yorkshire Dales S.C.)



Edited by iansmithofotley
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bigwavedave View Drop Down
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Post Options Post Options   Quote bigwavedave Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 05 at 9:38pm
Thats the stuff oxalic acid, and I think he then used white spirit or maybe turps.
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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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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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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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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!

 

 

URL]
http://www.yachtinguniverse.com [/URL]
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Buzz View Drop Down
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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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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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