3D Aquarium Background

Step 12: Apply the silicone to the back

Next apply the silicone to the back of the background.  Dont be shy about this step and add lots of silicone.  Even though it has cement on it, these things still float like life preservers so dont get skimpy here.  I ran a 1/4 inch bead about every 1/4 to 1/2 inch across.  I dont know if it makes a difference but I ran the silicon lengthwise along the pieces.

Comments

[Pseudocrenilabrus]

As long as it says 100% silicone and is the clear kind, you can use it. I've built a lot of aquariums. Even if the label says "Not for aquariums or underwater use", it's still alright if it's 100% and clear. The companies just put that disclaimer on there because they were getting too many yucksters that didn't know a thing about building aquariums calling them and wanting retribution for a hundred gallons of water ruining their hardwood floors after a seam gave way. But it wasn't the silicone, it's amateurs trying to built big tanks and doing it wrong.

[dissidence]

i hope people use aquarium rated silicone you cant just use any silicone,

[Rainh2o]

ilicone such as GE silicone 1 is good. Must be 100% silicone, no mold inhibitors or mildew resistance and it must be silicone and not caulk. I used red devil architectural grade 100% silicone. It has nothing in it that can kill the fish once its cured.