What would cause silicone not to harden?
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What would cause silicone not to harden?

  1. #1
    I'm No Expert Shaun's Avatar
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    Default What would cause silicone not to harden?

    I opened a brand new tube of GE window & door Silecone II and sealed my pump up last night. Today i come out and it's still as wet as it was when it came out of the bottle. Figured ok maybe because it was cold last night, so i pull the boat out into the driveway so the sun and get at it and it's still wet. What would cause this, i was thikning maybe i bought one that was old?

    Sucks cuz now i ahve to pull the damn transom plates again!!!

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    yep its no good. I have founf that if the stuff doesnt have that real bad smell to it then its old and wont harden. I did the same thing once and installed a pump just to have to re do it because the stuff would not set up.

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    Senior Member Rivernut's Avatar
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    The GE Silicone II is crap. They say not to let it get above about 90 degrees or so, if it does, it won't harden. Had it happen many times. Who's garage doesn't get above 90? It could get above 90 in a semi trailer during transport or in your car while shopping. Go for the older style 100% Silicone I with the acetic acid / vinegar smell. it speeds up the hardening with water, just what our group needs.

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    Jackwagon Patrolman Rexone's Avatar
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    Use a good marine grade silicone, like Boatlife. Not all silicones are the same.

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    I'm No Expert Shaun's Avatar
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    I've been using GE Silicone II because thats what [email protected] told me to use. Thanks for the responces. I guess it's possible that the tube could have gotten over 90*. I think i might have brought this tube to the river with my last trip out just-in-case. Never opened it, figured it would just get hard, not stay soft!

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    CLASSIC HOTBOATER wideopen's Avatar
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    GE Silicone II swells when oil hits it
    it will break down and peel off if it even sticks
    use 3m 5200 and never look back
    spider monkey racing

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    Senior Member blownjet's Avatar
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    Use a commercial grade NEUTRAL silicone

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    Senior Member Boat 405's Avatar
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    Don't worry it won't be the last time the TA plates have to come off.
    Boat 405.

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    www.highflowdynamics.com LakesOnly's Avatar
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    Cool

    Always run a test bead first to check for curing before actual use.

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    Re-member Willie B's Avatar
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    Quote Originally Posted by wideopen View Post
    GE Silicone II swells when oil hits it
    it will break down and peel off if it even sticks
    use 3m 5200 and never look back
    ...X2...

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    Senior Member EVILFORCE's Avatar
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    Maybe it it the kind they use in boobs.
    No Fool Like A Old Fool is there?

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    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by widowmaker View Post
    Don't worry it won't be the last time the TA plates have to come off.
    lol, ya dont doubt that! This GE Silicone II was a pain in my ass to get off the plates this time around. I'm scared to use somthing stronger

    What do you guys usually use to remove the old silicone but not kill and Scare the powdercoat?

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    Senior Member moneysucker's Avatar
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    I have had the GE do the same thing. Old silicone is crap. I always return tubes that have not been used over the course of my jobs because I don't want to use them after too long. I use Ultra black RTV on mine because it is made to withstand oil. I have also used caulking intended to seal gas pump sumps which is oil resistant as well.

    Cy
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    Senior Member tahitijet's Avatar
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    Quote Originally Posted by Shaun View Post
    lol, ya dont doubt that! This GE Silicone II was a pain in my ass to get off the plates this time around. I'm scared to use somthing stronger

    What do you guys usually use to remove the old silicone but not kill and Scare the powdercoat?
    no matter what you use it's still a pain but i think it was cyclone that suggested white fuel (camping stove fuel) and it works rather well. and doesn't harm the powder coating or paint.

    as far as silicone i've used everything i can find to seal my setback and everything I used had to be redone. Finally at the recomendation of rex i bought a tube of boat life. best stuff i've found, hasn't turned colors, softened or leaked 1 drop. Someone else on the board highly recomended something called lexol or lexor from ACE. my local ace didn't carry it up until just recently so i haven't tried it but I know the boat life works and the price was the same.

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