WTH!!!!!!! Silicone problem.. - SailNet Community
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post #1 of 19 Old 03-08-2013 Thread Starter
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WTH!!!!!!! Silicone problem..

Picked up my new fwd hatch lens yesterday. Spent an hour or so fitting it to the *some sorta* plastic surround. Since the Lexan doesn't like anything but silicone or an odd mix of something. I stuck with silicone.
I was going to use black RTV adhesive/sealer; but a friend gave me a tube of "BoatLIFE" silicone..said it was what he used on his boat when silicone was called for. The instructions say that it skins over in 10 minutes and cures for use in 24 hrs..... Well!
I installed the Lexan last night at about 8:00 p.m. As of this past minute, the silicone has still not set, skinned over or anything even close to either! 60-some degrees in the basement; and now upstairs at nearer 65 for the last 4 hrs... still no joy. A sticky mess!!!

In my experience, when Silicone goes "bad" it simply sets. Old tubes of GE, OSI and others product; some never even opened, after a few years go solid. I've never had a sealer not set!

Anybody ever hear of this going off with a silicone product?
As it stands now, it looks like I'll hafta pull the Lexan and spend a half-gallon of alcohol to clean up the mess. THEN, I'll spring for a new tube of RTV and be done with it!

WTH??????

S/V Chrysalis
'80 Watkins 27
North East, MD

Last edited by deltaten; 03-08-2013 at 12:22 PM.
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post #2 of 19 Old 03-08-2013
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Re: WTH!!!!!!! Silicone problem..

I have seen this happen with an industrial high quality Dow Corning silicone (forget the number). It clearly has a shelf life after which it changed consistency- didn't harden but was a little firmer than usual, and when I used it, it didn't cure as usual. Now that you've gone that far, I'd let it sit for several days and see what it does.

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Re: WTH!!!!!!! Silicone problem..

One more thing to try. Silicone requires atmospheric moisture to cure. I don't know the range of humidity required, but you might try putting it in your bathroom or someplace that's fairly humid and see if that helps.

Mark Smith
1977 C&C 30 Mk 1 hailing from Port Clinton, Ohio
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Re: WTH!!!!!!! Silicone problem..

Silicone and boats, is bad news. This is an omen.
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post #5 of 19 Old 03-08-2013
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Re: WTH!!!!!!! Silicone problem..

Quote:
Originally Posted by sony2000 View Post
Silicone and boats, is bad news. This is an omen.
Actually most non-vinegar smelling silicones are fine.. like DC 795... but they definitely have a shelf life (and a 'use before' date stamp - so check before you buy)

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: WTH!!!!!!! Silicone problem..

I agree with both Sony and Faster. I hate silicone on a boat, but bedding the hatch lens is a good place for it, as long as you use the right silicone. The DC 795 which Faster mentions is not your ordinary hardware or marine store silicone. It has very high elasticity is very durable. It does have the same problem all silicones have in that nothing will bond to it ever, but I've had very good luck with it for hatch lenses. It definitely has a shelf life, though, even an unopened tube, and it's not all that long.

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Re: WTH!!!!!!! Silicone problem..

Shelf life, huh? Well, that might be it.
Nothing listed on pkg or tube as date. Doubt if it's more than a year or so old. No vinegar typical smell; still gooey and came out of the tube OK. Listed on pkg as "fast curing" tho; so I guess I'll be R&Ring the lens

UNderstood about regular siicone as poison for most boat projects. Simply put.. Lexan is to be installed with silicone or silicone/urethane mix.. a specialty sealant for hi-rise glass work, as I understand it. Most common marine plastic glazings abhor most glues/caulks and such, so I didn't wanna melt the lens OR the unknown surround

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Re: WTH!!!!!!! Silicone problem..

I discontinued the use of silicone many moons ago. Bad ju ju. I use Lexel for a lot of these applications now. Love it, if you can find it.
Lexel® - The superior alternative to silicone.
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Re: WTH!!!!!!! Silicone problem..

For caulking......Big Stretch is the shizzle
Big Stretch® - It won't crack—it just stretches!
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Re: WTH!!!!!!! Silicone problem..

Boatlife makes good stuff and I'd suggest calling them to ask what happened.

But as i recall, silicone won't permanently adhere to either Lexan or Plexiglass. Polycarbonate or acrylic, two very different materials.

Since so many people confuse the two, I have to ask, you are sure that you have Lexan, not an acrylic, there? Special adhesives, special primers. Silicone will not adhere in any long term, although it may flex enough to seal the trim ring.
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