I'm sure hoping your not trying to put new silicone over silicone that was already placed down. It will not properly hold. Just a word of advice, when you silicone a tank all the silicone needs to be placed at one time. If you overlap or place any newer beads over older it is possible to hold water for a while, but eventually it will give away and there will be a huge mess.
Nice score on the tank though!
Nice score on the tank though!





