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View Poll Results: Which is the best teak treatment ?
Teak Wonder 0 0%
Semco 8 53.33%
TeakGuard 1 6.67%
Cetol 5 33.33%
Other 2 13.33%
Multiple Choice Poll. Voters: 15. You may not vote on this poll

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  #11  
Old 03-26-2012
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Re: Teak Deck Treatments - The Best ?

Quote:
Originally Posted by RichH View Post
I have full teak decks. I use SEMCO with outstanding results.

Letting decks go 'grey' constitutes an abandonment to Ultraviolet destruction of the surface wood cells which then easily erode. With the price of teak at now $50 per board ft., without 'sealing, etc.' you will be replacing the deck in approx. 15-20 years, or sooner.
There is absolutely NO reason to keep a laminated teak deck 'wet' with seawater, and the chemical composition of seawater accelerates the erosion of the teak surface.

SEMCO is great but is slowly lifted by 'green water' and therefore needs continuous coatings at 4-6+ month intervals. SEMCO allows the teak to become wetted and thus its usage keeps the 'footing when wet' just a bit under the characteristic unsurpassed 'non-slip when wet' characteristics of a bare deck.
Only real downside is that SEMCO eventually 'transfers' to boat shoe soles and such shoe soles will need to occasionally 'sanded' to regain their 'wet traction'.

Other 'mixtures' Ive used, and with slightly longer 'service time': 1/3 SEMCO : 1/3 Teak Wonder : 1/3 Olympic Deck stain (w/50% carmel tint) ... but 'recoating' may involve 'splotchiness' if worn away by constant 'green water'. The eventual 'transfer' of the mix to boat shoe soles is a bit faster than with SEMCO alone, so you just need to 'sand the soles' a bit more often. Such 1/3:1/3:1/3 mixtures will typically last 2+ years with 'maintenance coats' in the 'worn-off areas'.
Info on the 'mixes': TOG Photos, Projects & Publications ---> FTP download ---> projects ---> decks ---> Teak oil Test/

The best characteristic of both SEMCO and SEMCO 'mixes' is that the teak still 'wets out' when covered with water, not as non-slip as a bare deck but 'close' to the non-slip when wet as bare teak.

All these coatings are easily stripped off with TriSodiumPhosphate (TSP) ... just dilute the TSP/water mixture so that the 'stripping' doesnt extract 'too much' of the tannins/oils of the teak, then bleach the deck with oxalic acid to restore 'color' (I like bleached teak as it keeps the deck 'cooler' on the feet, etc.).

The absolute WORST teak deck coating has to be Cetol or Teak Guard ... great for outstanding slippery-ness especially when wet AND has to be sanded deeply to repair. Cetol also cracks/crazes with age.
Thanks for your detailed reply - I really appreciate it. So I am now wondering about Teak Wonder by itself - what are your experiences ?

Thanks,

David
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  #12  
Old 03-26-2012
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Re: Teak Deck Treatments - The Best ?

Teak Wonder doesnt seem to have any UV blocker, probably why SEMCO (pigmented), or a mix of Teak Wonder + Semco, does a better job in protecting against 'the greys'.
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Re: Teak Deck Treatments - The Best ?

OK, thanks for that - makes sense, but interestin that addition of Teak Wonder seems to extend the life of Semco
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Re: Teak Deck Treatments - The Best ?

We use Semco but avoid pigmentation which seems to build up unevenly and requires sanding to remove. However, re-treatment seems more frequent, but easier.
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Re: Teak Deck Treatments - The Best ?

Yes, that makes sense too. We have seen one yacht where the pigmented version was used, and it was very obvious over the black caulking. We wondered if applying with a pad rather than brush would avoid this problem (wipe on, wipe off - except where the teak absorbs it). By the way, what is the difference between 'Clear' and 'Natural' ?

Thanks,

David
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Re: Teak Deck Treatments - The Best ?

When we bought this boat, the teak cockpit sole and seats were sealed with Cetol. Gross!! Not only did it look fake, it would flake off in little dust particles. You reminded me of this, because the black caulking was indeed covered as well. We had it all scraped and sanded down, but it never fully came off the indented caulking. We have been waiting for years for it to just fall off, which it continues to do.

The idea also has me wonderng if, over time, you will sand or use caustic two part teak cleaners more often on a sealed deck, in order to clean it up for reapplication. That has to have as much, if not more, impact than UV.

If you don't like the look of silver weathered teak, that's definitely a fielders choice.
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Re: Teak Deck Treatments - The Best ?

It would look gross - brightwork OK, but the sole - no thanks.
Motivation for sealing is partly to retain the 'fresh sanded' look as much as practical, and partly to keep in as good a conditon as possible for as long as possible.

From the comments, I think we will go for clear Semco, and see.

Thanks for your input.

David
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Re: Teak Deck Treatments - The Best ?

We have always used a foam applicator rather than a brush. ClearTone has no pigmentation, and Natural has the least pigmentation. We have started with GoldTone and over the years worked our way down to ClearTone.

Semco Products

Before applying Semco, very occasionally we sand. We usually prepare the teak with Amazon's Teak Prep which seems to darken the teak a bit.

MD Amazon

We use Amazon's Lemon Oil for the interior wood but which is not teak.

Formerly we used teak oil on the exterior teak which became severely mildewed. The best product, which means works and is mild, we've found is Pink Solution that we discovered at a boat show in UK but that is marketed there under a different brand that I don't recall.

Pink Solution

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Re: Teak Deck Treatments - The Best ?

Quote:
Originally Posted by David B View Post

From the comments, I think we will go for clear Semco, and see.
Clear Semco has no pigment, thus no UV protection and you'll wind up stripping it much sooner. The 'natural' has some pigment and better prevents (UV damage) greying, not as good for UV as the goldtone, needs more frequent application but does 'blend' with the prior coats for a 'decent' color match.

All my caulking (TDS single part oxime cure) seams are slightly 'proud' (purposely) so that when coating the decks with any sealant its quite easy to wipe it off the caulking lines with a rag
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Re: Teak Deck Treatments - The Best ?

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Originally Posted by RichH View Post
......All my caulking (TDS single part oxime cure) seams are slightly 'proud' (purposely)........
Doesn't that retain some water run off and dirt and make the decks harder to clean?
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