Chads said:
No, not of those seals. That was 10 years ago or so, that I stopped doing those seals.
It's pretty simple to do, though. The main thing is to make sure that the silicone doesn't get stuck to the tank lid. That's why we used two layers of Turtle Wax.
The bead of silicone doesn't have to be very wide. About 1/2" is good enough. Make sure that it doesn't get near the outer part of the flange, or it can leak around and touch a part of the lid that's not prepared, which will allow it to stick.
Weigh the lid down evenly. Don't put a single weight in the center. Better to use two or even three weights, to spread the pressure as evenly as possible.
A major point to stress here is to
wait until the silicone skims over and begins to feel slightly firm first, before adding the weighted lid.