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Post Info TOPIC: Marine caulk/sealant under new transom wood.


Meteor Contributor

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Date: Jul 26, 2011
Marine caulk/sealant under new transom wood.
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My thought was to brush on a light coat of marine caulk on the underside of the new transom wood I'm installing this week to create a watertight barrier.

I was going to apply it, then use a paint brush to spread it on the underside of the transom wood.

Is this the prescribed method?

Thanks,

Shamus



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Flyer Contributor

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Date: Jul 26, 2011
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I applied it straight from the caulking gun on mine. Then I tightened all the fasteners while the adhesive was still wet. I made sure I placed a good bead around the edges and around all the bolt holes. I should note that I predrilled all the holes in the transom board and then expoxied and varnished the board before installing it.



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1956/7 Ranger III
- 1956 Johnson Javelin 30 hp
- 1957 Evinrude Big Twin 35 hp
- 195? FrankenMerc 50 hp coming soon.


Flyer Contributor

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Date: Jul 26, 2011
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i did the same, but i used industrial contact adhesive by liquid nails.  definitely drill and varnish first.  and then once you tighten, you might varnish any areas that crack under the pressure of the washers.



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Meteor Contributor

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Date: Jul 26, 2011
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I've heard that POR-15 works really well to protect the wood, you just don't get the wood grain finish like a varnish as it's a solid colour. PL Premium Construction Adhesive might be a good choice to seal it to the transom but it might be a little tough to get off if you ever need to do it again.

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Flyer Contributor

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Date: Jul 26, 2011
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I know from experience that PL permium doesn't work well on aluminum boats. A marine adhesive sealant like 3M 4200 or Sika is the way to go.



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1956/7 Ranger III
- 1956 Johnson Javelin 30 hp
- 1957 Evinrude Big Twin 35 hp
- 195? FrankenMerc 50 hp coming soon.


Meteor Contributor

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Posts: 310
Date: Jul 26, 2011
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I've heard about using PL Premium on Fiberglass transoms so I was thinking it would be fine for aluminum too. What doesn't it do well?

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Flyer Contributor

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Date: Jul 26, 2011
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I've seen it crack, shrink and separate. That doesn't mean that it won't work. I've also it work, too.



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1956/7 Ranger III
- 1956 Johnson Javelin 30 hp
- 1957 Evinrude Big Twin 35 hp
- 195? FrankenMerc 50 hp coming soon.


Meteor Contributor

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Posts: 339
Date: Jul 27, 2011
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wbeaton wrote:

I applied it straight from the caulking gun on mine. Then I tightened all the fasteners while the adhesive was still wet. I made sure I placed a good bead around the edges and around all the bolt holes. I should note that I predrilled all the holes in the transom board and then expoxied and varnished the board before installing it.


 That's exactly how I plan on doing it.   Though, on the transom wood, I didn't epoxy it.  I just used high grade varnish - about 10 coats total on sapele mahogany.   I know that the epoxy is the best route, but the varnish should last me at least 5 years or more.



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Flyer Contributor

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Date: Jul 27, 2011
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I found some real nice milled cedar on my way to Wal Mart in Athens on monday. I think it will be perfect for all my wood replacement need on the Ranger. I thinking about using it to make a floor out of to.



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Damon


Meteor Contributor

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Date: Jul 27, 2011
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zigzag wrote:

I found some real nice milled cedar on my way to Wal Mart in Athens on monday. I think it will be perfect for all my wood replacement need on the Ranger. I thinking about using it to make a floor out of to.


 Cedar will most certainly smell the best!



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Voyager Contributor

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Date: Jul 27, 2011
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Any of the foregoing applications will work as long as the metal and the wood is buttered well with sealant, and a good bead is laid around the holes.  In addition to that, I also gooped up the bolts themselves with plenty of sealant, then torqued them down snug.  The bolts will probably require period re-torquing and a bead of sealant from time-to-time also may be called for following a close inspection.  But you're on the right track and your method should be more than adequate.  Mineral spirits applied liberally to a cloth rag (or water, depending on the sealant base), will remove excess and leave a neat finish. 



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Bob

"Those who are too smart to engage in politics are punished by being governed by those who aren't."          Plato

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