Problems with silicone.
Well, I have started my first try on planted aquariums. It's with a 5 gallon aquarium and everything is going pretty good. I have an intank-filter (hang on the side). It looks kind of bulky and lame and such. It's for a 10 gallon tank also, it just looks bad. So I thought I would make my own mini canister filter. Everything seems to be doing good, except the silicone won't stay stuck. I wiped down every so there would be no water or dirt or anything. I let it sit for like almost a week. And it just comes on done. I am using Silicone II Window&Door. 100% Silicone Sealant. When I learned how to do the mini canister filter, it said to use this.
Can someone help me out?