stains on teak

CapnRon47 · #1 (**permalink**) 03-16-2011

I stripped the old Cetol (used a heat gun) and sanded and sanded and sanded (150 grit), but I still have these stains on the teak.

Any suggestions on how to remove these? I intend to cover with Cetol Natural and then gloss, so I want it clean.

mitiempo · #2 (**permalink**) 03-16-2011

As far as I can see the 2 lighter patches in your first picture appear to be sanded enough but the rest still has Cetol on it and needs nore sanding.
2nd pic looks more consistent but also requires more sanding.

omaho5 · #3 (**permalink**) 03-16-2011

You may want to investigate using a solution of water AND oxalic acid on fully stripped teak.

mitiempo · #4 (**permalink**) 03-16-2011

Oxalic acid works to clean/bleach teak but unless the pictures show the wood wet there is still old finish remaining.

CapnRon47 · #5 (**permalink**) 03-16-2011

The wood was wet, I had just washed it and the cropped views I showed make it hard to tell if its Cetol or just the grain of the wood. I will let it dry and look at it tomorrow.

RichH · #6 (**permalink**) 03-16-2011

If you mean the 'tiger stripes' ... this sometimes happens to teak if it gets too hot from sanding or scraping (or using a heat gun), etc. The best Ive found is to finish the sanding, then cover with clear saran, etc. plastic wrap and let the teak exposed for a week or so in the direct sun. Oxalic and other bleaches usually wont alter the tiger stripes and other 'sap rich' areas - but the direct sunlight will. If you apply a coating to this before the 'stripes' fad, they will stay that way.

CapnRon47 · #7 (**permalink**) 03-16-2011

Here is a full shot, notice the rub rail looks fine, it is the toe rail that has the strips. I thought I did about the same on both with the heat gun and scrapper.

I can let it sit, I have hand rails to work on.

arf145 · #8 (**permalink**) 03-17-2011

Quote:

Originally Posted by mitiempo

As far as I can see the 2 lighter patches in your first picture appear to be sanded enough but the rest still has Cetol on it and needs nore sanding.
2nd pic looks more consistent but also requires more sanding.

I had the same thought, mitiempo. Cetol layers really hang in there.

Minnewaska · #9 (**permalink**) 03-17-2011

Maybe it's my monitor, but the toe rail looks like it has patches of cetol removed. The rub rail looks like there is still a consistent layer on it.

CapnRon47 · #10 (**permalink**) 03-17-2011

I forgot to take a picture today when it was dry. I will try to remember tomorrow (still working takes it's toll).