i tried it before... no worky... you could use a thin layer of elmers school glue... it dries clear... but it's pretty much fail and aids to take it off...
you did not use enough oil.i had 4 tanks for over 5 years and most tanks are gone now but the back round is still on all of them.makes your backround come to life
the backround i used was too wrinkled and used to being rolled up... so it got long bubbles along the back... another tank i tried the oil too, but the backround paper was too big i guess... both of these tanks were 100g tanks...
so now i use spraypaint, tiles or no backrounds at all...
i did it before i set up the tank.i just poured it on. i guess a brush or sprayer would work.just use alot , use your id or somthingto get all the bubbles out. ps{dont spray in tank...lol}
I used vasoline, its a little diff to smooth out, but it looks great. In some areas i was trying to get the air out, and i looked in the tank, and it was like clouds and streaks, i like it, so i left it.