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Old 01-22-2010, 07:01 PM   #1
IrregularPulse
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Default Why didn't my silicone stick?

I bought the 108 Silicone from Mc Master car to join a SS washer to my Plastic cooler. Cleaned both services with rubbing alcohol, applied a bead of silicone around washer, placed face down against flat plastic surface, and put a few pounds of weight on top. Cure time said 20 mintes. I let it go 45 and then then I grabbed the washer, it lifted up with 0 resistance and there was a cured bead of caulk on it.

I bought the 108 HERE. Should adhere to plastics and metal like it says right? Specifically Stainless Steel and plastic.

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Old 01-22-2010, 07:50 PM   #2
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I don't know what kind of plastic a cooler is made from, but I've never gotten anything to stick. I want to seal the hole where my pre-chiller lines go in, I tried silicone, epoxy, jbweld, etc. Nothing. Sticks to the copper fine, just not the cooler plastic.

I'll be watching for anyone else's solutions...

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Old 01-22-2010, 08:03 PM   #3
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The only epoxy I found that sticks to plastic well is aquamend. Silicone does not stick to much of anything including itself. They make special cleaners / pretreatment solutions to make it stick to stuff.

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Old 01-22-2010, 08:06 PM   #4
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Probably work better if you sand the surface of the plastic before trying to stick anything to it. The plastic's surface will be very smooth, which doesn't give adhesives anything to grab a hold of.

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Old 01-22-2010, 08:08 PM   #5
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Just an idea, but most of those molded plastics have a "Mold Release" coating on them, that prevents them from sticking to the molds...

Note: I have no experience trying to stick anything to coolers... but...

Try a fine grit sandpaper and get below the "Non-stick" shinny coating around the area and try again. This should serve 2 purposes, 1. remove the non-stick coating and 2. give a roughened surface for the silicone to stick to. (much on the principle of paint to a smooth surface vs a sanded one)

Hope this helps and good luck!

Cheers,
Mark

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Old 01-22-2010, 08:12 PM   #6
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I had drilled my heating element hole too big and want to reinforce it with a SS washer I had drilled out to fit snog around my element threads. It will serve to reinforce the coolor bottom as well. Just need i tot seal.

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Old 01-22-2010, 09:13 PM   #7
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I'm gonna try and rough it up with some 4-600 paper over the weekend. Sounds it it just is too slick to grab onto. When all said and done, that joint will be secured together by the Nut pulling against the hot water heater element. I just wanted to make sure it was sealed first.

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Old 01-22-2010, 09:53 PM   #8
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Nearly 11k posts but you can't properly drill a hole...I recommend you start spending a little more time away from your computer.

Just busting balls

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Old 01-22-2010, 10:11 PM   #9
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put some hair around it

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Old 01-22-2010, 10:30 PM   #10
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600 grit to *rough it up*?
how about 100?
bigger scratches will give any sealant more "tooth".

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