Replacing silicone around glass shower screen

[GBC]

The video nails it and definitely dry beforehand although they do have underwater silicon but I've never tried it.
Here's a factoid I didn't know til recently. Apparently it's humidity that sets silicon and not air which prolly explains that underwater stuff.

polyurethanes like sikaflex use moisture in the air to set. Silicones either release acetic acid (acetic cure) or methanol (neutral cure) to set. Neutral cure is good for ferrous metals, bitumen and other things that don't play well with acid. Acetic cure is what Beachman wants for the bathroom/kitchen as it will etch into the tile/glass face and get a better bond. The acid will also displace some water, and make the silicone set quicker. Hope this helps.

[Hefty]

polyurethanes like sikaflex use moisture in the air to set. Silicones either release acetic acid (acetic cure) or methanol (neutral cure) to set. Neutral cure is good for ferrous metals, bitumen and other things that don't play well with acid. Acetic cure is what Beachman wants for the bathroom/kitchen as it will etch into the tile/glass face and get a better bond. The acid will also displace some water, and make the silicone set quicker. Hope this helps.

Actually, acetic cure still relies on moisture from its surroundings to cure. I use acetic cure silicone to make a cheap version of the moldable silicone glue 'Sugru' by mixing with cornflour. (search on instructables.com for 'Oogoo') The cornflour is anhydrous and so pulls in extra moisture for a faster cure.

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[GBC]

Thanks Hefty, I think I just found out how I am going to stoneproof some fittings on my camper - you learn something new every day. I can think of 10 jobs I can use it for straight up. So once it is mixed you can handle it without it sticking to you?

[#jonesy]

oh to add to it, dont use shellys, in white. it goes yellow. yes i know on the packaging it says non yellowing.

I can second that. I only use Parfix now.  When I did my white glossy bathroom I paid for the name brand Selleys, which went yellow in no time. The few spots that are white is where I used an old tube of the "cheaper" Parfix as I had run out of Selleys.  The Parfix is still as white as the day I used it.

Maybe it is non-yellowing but it looks like Richie Benaud's off white / bone / cream / .... jacket