Teak problem

Sandro said:
Thanks to all for the advices.
I did not use any special "teak oil" but old boiled lineseed oil thinned in turpentine just because I thought to do good to the wood.
Now I understand that teak can do very well also if left alone and so I shall do. I like the silver grey of weathered teak.
The problem is now to remove the black thin lines in the grain. I shall try some more chemical. If no result, I shall do a little more sanding but not too deep and leave it so. I like better to have some black marks than removing a lot of wood.
After all "Giulia" is a 35 years old lady and it is not a terrible sin if she show it.
I shall post if I find some miracle cleaner.

Fair winds

Sandro
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the wood is clean, oxalic will remove the black.
 
ccscott49 said:
I would never use or recommend the use of Hcl, for cleaning wood and I've seen a lot of teak brighteners and never seen Hcl in any of them. There is another acid in them, that sounds like hydrochloric, but for the life of me cant remember what it is and its not hydrofluoric.
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You obviously haven't seen this one

http://www.snappyteak.com/downloads/MSDS-2.pdf

This is not one I'm actually familiar with but it's MSDS was available via Google.

The one I am familiar with is Wessex. Their Renovator (Brightener) was definitely HCl a few years ago but their MSDS is available on request so I can't confirm immediately. I'll post again if I can get hold of a copy.

Oxalic acid is an alternative to HCl in some products.

Edit

Just found that Teak Wonder also contains HCl

http://www.teakwonder.co.uk/SafteyDataSheets/TWBRIGHTENER-SDS.pdf
 
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I have cleaned similar stains with 3 or 4 sodium percarbonate washes (I brushed it in gently, left it for 15 - 20 mins and rinsed out) followed by a couple of oxalic acid washes. Worked well.
 
If it is mould or fungus you are dealing with apply Boracol 5R. I have tried many alternatives to keep my decks yuck free and Boracol (similar to borax) is by far the best. Bonus; it is easy to apply. I do not think this can be purchased over the counter. Google will yield a supplier.
 
The black matter in the teak is most likely be a surface mould that gets into the grain. Try using Boracol 5Rh it will get right into the teak and kill any moulds/algae without having to scrub or sand your teak, two coats then sit back and wait for the Boracol to work. I have seen some on Ebay.
 
Just to emphasise how good Boracol is, here's a recent pic of my deck, which hasn't been cleaned for at least a year...

Fslide1-11.jpg
 
I agree with Viva. It is normal to get fungal growth on teak decks. How you deal with it is what matters. I have tried many solutions and at present my preference is for Boracol 5R. It is easy to apply and all that is required after application is time. 2 weeks in fact. Recommend regular rinse with salt water not fresh water (no option here for lake boat!)
 
The only treatment for teak is a baby wipe, covered with the hymen of a freshly deflowered beluga whale, dipped in a mixture of rose petal water and the perspiration of a Trappist Monk.

Apply gently, at midnight, on a full moon, whilst chanting 'om mani padme hum' fifty three times.
 
>While you may have to sand it out, I would strongly recommend trying a fungus remover first - there is a limit to how many times you can sand so aggressively.

Yes treat the deck first for fungus but if that doesn't work it's the Castor oil in the Teak oil. As I mentioned use pure Teak oil and you will only have to sand it once. I did it with sandpaper and you don't have to sand much off the remove the black. No need to sand it aggressively.
 
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