black bits!!

[AlistairM]

I have taken all my varnish back tot he wood and noticed one or two black sections and some not so black sections. Whats the panels view on the best way to treat this ?

Thanks

 

[BlueLancer]

You did not say wether the staining was from water damage or not. Assuming its not from water, you could try bleaching the wood with Oxalic acid. This will remove all the colour ,so you would have to restain to match surrounding area. This works on most stains I have not tried it on water damage,it may work. More experienced fourmites will no doubt answer that.

 

[AlistairM]

Sorry !!!

I am preety sure its water ingress, I found it beneath the varnish I have taken off and some of the worst patches were showing through before that.

Thanks

 

[KenMcCulloch]

[ QUOTE ]
Sorry !!!

I am preety sure its water ingress, I found it beneath the varnish I have taken off and some of the worst patches were showing through before that.

Thanks

[/ QUOTE ]
Leave it to dry for as long as possible before revarnishing is one piece of useful advice.

 

[mclark]

Is it mahogany? if so I have found oxalic acid solution is very good for removing staining. Buy the crystals from the chemist and mix to form a paste.

Paint it on (doesn't matter if it gets onto the unaffected part), give it 20 mins or so and then rinse off.

You should find the stains almost completely gone.

 

[Romeo]

[ QUOTE ]
[ QUOTE ]
Sorry !!!

I am preety sure its water ingress, I found it beneath the varnish I have taken off and some of the worst patches were showing through before that.

Thanks

[/ QUOTE ]
Leave it to dry for as long as possible before revarnishing is one piece of useful advice.

[/ QUOTE ]

Painting, rather than varnishing, hides the evidence completely!

 

[absit_omen]

[/ QUOTE ]Painting, rather than varnishing, hides the evidence completely!

[/ QUOTE ]

As I have just realised having painted my (substantial) rubbing strake after many years fighting the black.

I love varnishing but, on this occassion I feel like I have been released from purgatory.

 

[Seanick]

Re Oxalic acid.
Buy it from a chemist
Mix as much powder as you can into hot water (super saturated solution)
Paint on to the black areas
Cover with cling film to reduce dryimg and keep the mixture working for longer
Re-apply
Rinse with clean water
allow to dry
sand and coat

If that does not work, and the staining is deeper, say from and iron fastening, then it becomes an 'Honourable Scar Of Time'!
Live with it, enjoy it!