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post #1 of 9 Old 03-14-2012 Thread Starter
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Sealing port lights

This is my first thread. I own a 1984 C&C 32. I removed the port lights and want to reseal them. They are frameless so it will require a sealer adhesive. The adhesive recommendation from C&C was over $400. If you have resealed C&C frameless port lights and were successful - what did you use

Thanks in advance
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post #2 of 9 Old 03-14-2012
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Re: Sealing port lights

$400? What was it?

Dow 795 is probably the best adhesive and not very expensive. It is a structural silicone.

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Re: Sealing port lights

The factory stuff is Plexus MA590 and available through US distributor/dealer Plexus Products - ITW Plexus. You might find a competitor with similar product. They might have a product with shorter work time, but if you are a novice the one hour stuff will remove some of the panic on installation, although you will need to hold it in place until it sets. Recommend you tackle one window at a time to get the hang of it. We used this on '85 C & C 32 with great success, paid $115 a tube but you might get a better $ if you can deal direct rather than through dealer. Might also get it from an acyric fabricating shop.

Be prepared for gel coat repairs to the recessed flanges too, and make sure you don't remove protective paper too soon. They ideal is to get the adhesive to set below the deck/window edge so you can lay in a flush bead of silicone to cover the grey adhesive.

BTW - where are you out of? Do you have centerboard or fin keel?
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post #4 of 9 Old 03-15-2012
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Re: Sealing port lights

On my previous boat, a C&C33, I used Plexus MA320 bought from South Shore Yachts, who also rented/loaned/supplied the super-heavy-duty caulking gun needed to get the stuff through the static mixer nozzle. It came in a single cartridge with a ~12" long mixer nozzle. Don't recall the price at the time but it was about a dozen years back. Worked well though, did not even need silicone or anything to cover it.

As I recall, it took most of the working time (plus the effort of a beefy nephew on the gun) to apply the stuff, so a slower product would not be a bad idea.

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Last edited by redline; 03-15-2012 at 03:59 PM. Reason: fix typo C&C (!)
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post #5 of 9 Old 03-15-2012
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Re: Sealing port lights

I wonder if any of the 3M VHB Tapes would do. You can get varying thicknesses that will offer a little give for expansion. I've heard/read an article where someone used it to glaze companionway doors.

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post #6 of 9 Old 03-15-2012 Thread Starter
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Re: Sealing port lights

Thanks,
The Plexis MA590 is the $400 adhesive. I was told you could do 1&1/2 ports per tube. So I would need 3. How many tubes did you use? The rest of your instruction were interesting. Did you use the Plexis and a silicone sealer?

I was really hoping someone was going to say they have used a Dow or 3M product and it worked for 10 years. I'm cheap but don't want to regret my choice.

BTW - I am out of Sodus Bay on Lake Ontario.
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Re: Sealing port lights

Dow 795 is used by many and is nothing like the silicone you see in the hardware store. Select Plastics, the largest marine hatch repair facility in the world and a plastics supplier/fabricator gives their opinion here Which Sealants To Use as well as other good advice.

Dow 795 is also used to attach glazing on office towers - without fastenings.

As well, it is not very expensive.

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Re: Sealing port lights

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Originally Posted by mitiempo View Post
Dow 795 is used by many and is nothing like the silicone you see in the hardware store. ...As well, it is not very expensive.
$10/tube last time I checked/bought it. Have used in on several occasions with complete success.

Ron

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".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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Re: Sealing port lights

The Plexus is used by many builders to attach hull and deck and attach liners and stringers in hulls. Good stuff but not what I would use for ports.
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