Sealent for Under Teak

[szymek]

Hi Folks,

I've just taken nearly all the teak off and I'm almost done with applying Cetol natural teak and gloss. I just have one question. What should I use for sealer/adhesive under the teak? i'm planning to put something on the screws to seal it and maybe a bead along the teak/

1) Should i use 3m marine silicone? 3m 5200? or 3m 4200?
2) should i also put a tiny bead on the outside to prevent water going under?

Thanks a million!

[GordMay]

Use a POLYSULFIDE sealant:

2-Part Pourable: ➥ Life-Calk Two-Part Sealant Type H (Heavy) Quart - Polysulfide | Life-Calk | BoatLife Industries | For the Life of Your Boat

1-Part Caulk: ➥ http://multimedia.3m.com/mws/mediawe...6EVs6E666666--

See the excellent tutorial ➥ How to maintain and caulk teak decks on boats.

[cburger]

"Teak Decking Systems" caulk, formulated for this application: TEAKDECKING SYSTEMS

[GordMay]

Originally Posted by cburger

"Teak Decking Systems" caulk, formulated for this application...

TDS Teak Caulking is a one-part, silane polymer system. Silanes are chemical compounds of silicon and hydrogen.
I’m not familiar with this product, or class of chemicals.

[FSMike]

Uh, guys, that's great info but probably a bit of overkill. The OP has a Catalina 25. I rather think he's talking about some teak handrails, etc, not a whole deck.

[GordMay]

Originally Posted by FSMike

Uh, guys, that's great info but probably a bit of overkill. The OP has a Catalina 25. I rather think he's talking about some teak handrails, etc, not a whole deck.

Good catch!
For which I'd recommend 3M "101" polysulfide caulk.
Mask the exposed (visible) wood & deck.

[rebel heart]

Originally Posted by cburger

"Teak Decking Systems" caulk, formulated for this application: TEAKDECKING SYSTEMS

Originally Posted by GordMay

TDS Teak Caulking is a one-part, silane polymer system. Silanes are chemical compounds of silicon and hydrogen.
I’m not familiar with this product, or class of chemicals.

TDS is a great one part caulking for teak decks. Honestly I've gotten good results from Boat Life Caulking as well, but TDS is my defacto sealant for the decks.

[barnakiel]

A polysulfide.

Go to 3M or Sika homesite - they have a nice pdf for which adhesive goes where and how to apply it.

b.

[GordMay]

Originally Posted by rebel heart

... Honestly I've gotten good results from Boat Life Caulking as well, but TDS is my defacto sealant for the decks.

Boat Life Caulk is another Polysulfide product.

[Jim Cate]

G'Day mate,

In particular, DO NOT use 5200... you would likely break the bits trying to get them off the next time you want to do the brightwork!

Cheers,

Jim

[GordMay]

Originally Posted by Jim Cate

G'Day mate,

In particular, DO NOT use 5200... you would likely break the bits trying to get them off ...

"5200" is a Polyurethane, and isn't compatible with oil (as in oily teak wood). Accordingly, although uysually a very tenacious structural adhesive, it may not stick very well to teak.
Notwithstanding, the recommended adhesive/sealant/ bedding is polysulfide.

[szymek]

Thanks for all the info.... It's a lot more than I was expecting.

I'm not doing entire deck. I'm working on Catalina 25 and I'm working on mostly decorative teak (handrails, companionway, pop top, etc....) I've ended up taking everything off as after few pieces it looks like it hasn't been done in a very long time (I mean the teak wasn't looking very good under and on companionway actually i ended up repairing some of the fiberglass). It took me quite a while to clean everything, fix the fiberglass and apply layers of natural teak and gloss but this weekend i'm ready to put everything back on.

So my main goal is to ensure to seal all the screws and put something underneath it to ensure no moisture gets in. I was going to use 3m 5200, but i don't think i'll go that route as it's too permanent. Seems like Boatlife caulk is the way to go.

Let me know anything else i should know as I'm planning to put all the teak back on the boat this weekend.

Thank you kindly for all the responses!

[barnakiel]

Originally Posted by GordMay

"5200" is a Polyurethane, and isn't compatible with oil (as in oily teak wood). Accordingly, although uysually a very tenacious structural adhesive, it may not stick very well to teak.
Notwithstanding, the recommended adhesive/sealant/ bedding is polysulfide.

Exactly so.

And do not forget the plank gets glued to the deck only at the center while the edges of planks get glued to each other (meaning you will use non-sticky strips, or a special release agent under the seams. Otherwise the seams may and will split from the planks.

b.