So I silicones my aquarium yesterday and I used a 1/16inch spare or zip tie to then silicone into and after I was done it was perfect with no air bubbles at all and now after two day it has a thin strip of air in the center of the seal? Could this be because the silicone on the outside dryer faster causing it to shrink then pull the inside apart a little? I cleaned everything with acetone before assembling with rubber gloves on and with long free towels so I know the surface was clean and also when I was done siliconing the whole thing it had no air bubbles in the seal so I have no clue how it got there :/