I use aquarium silicone for mine. I buy it from the same supplier (GE) that I buy silicone for, for our glass work. I use the aquarium silicone because it does not have a mold inhibitor in it as does the regular. The mold inhibitor is toxic. U can buy this at a pet store. I believe they have it with a screw on lid. But I am not sure. The ones I use have the screw on nozzels that I have to cut to size, if u have to buy a regular caulking gun tube size,when u r finished with it u have to do this to keep it from drying out. First squeeze a dime size of silicone out (a rounded dime in both directions) and then lick your (i use my middle finger) finger making sure it is really wet then tap gently down the dime size around the opening to keep the silicone from drying out. Make sure to release pressure after squeezing out the silicone before doing this. Then set it up to dry. I know it sounds silly, but spit is the only thing that silicone does not stick too! :wink:
