Personally, I never had much luck with the method on that sticky.
What I do with all my tanks is get a bit of filter sponge, cut a square to fit the outflow, then attach it with a rubber band/hair band(without metal). Like so:
This I've found, out of all the methods I've tried(the water bottle and the nylon womans pantyhose), has been the most effective at baffling the flow of most filters.
Are you sure that's safe? I've always read you don't want to put anything over the outflow.. you can put something UNDER it but over it will reduce the flow and cause issues.. I am looking into a method where you use the pop bottle but then stuff a sponge under the outflow (but not over it).
I've never read anything like that before, and I've been doing it for a couple years without any issues and great success....I don't see how it could be unsafe. It doesn't completely restrict the flow provided the sponge you get doesn't have really REALLY fine pores, there is still some water movement but its just slowed.
What I tried the water/pop bottle method I couldn't get it to work a all. The flow was just redirected and my boys still had trouble. I slipped the foot of some nylons over the outflows and secured them in a similar way but those always slipped, so I finally came to the sponges and they've always worked very well for me.