70. TOOLS

Leave 1/16" between the panels. If you try to go less than 1/16" you will end up with bubbles in the silicone.
You can even leave a little more than 1/16", Aric says.
You have to run blue tape down the glass on both sides so there would be four strips of blue tape. You want the blue tape to go up to the little 45 degree arrisses on the flat polish.
There are two ways to silicone the joint. If you end up with a little more than 1/16", you can cut a small tip on the silicone cartridge and squeeze silicone into the joint, making sure that the silicone squeezes out on the other side. You don't want voids.
Using the sleeve over top corner clamp (SOGC90) you can easily lean one panel out a bit to allow for easier squeezing of silicone into the joint. Then push them back together and tighten the top clamp, leaving 1/16" between panels. Don't forget the blue tape. Then run your finger down the inside and outside, pushing hard enough to get all the excess off the blue tape.
It is important to get the excess off the blue tape. It is best if you and a helper run your fingers at the same time so that it doesn't push more back out on the other side. If you leave some excess silicone on the blue tape edge, when you pull the tape off it will make a mess.

Then pull the tape off immediately and you're done.
You may have about ten minutes to fiddle with silicone before it skins over, depending on humidity. The silicone will take a day or so to completely set up. When it does, the joint is amazingly strong. You can completely remove the top corner clamp if you like.

If you pul the tape off and want to finger the silicone again, here's a good trick. In the spray bottle mix water and dishwashing soap and spray the area before fingering it. Quickly, you only have a couple of minutes. This will make the silione NOT stick to the glass which is now covered with soapy water. Then you can smooth it out. The more you mess with silicone the bigger the mess gets. It's best to stop right now and let it dry. You can go back tomorrow and clean it up with razor blade. Razor blades will not scratch glass, by the way. It's the dust or microscopic paint particles that scratch the glass.