Polystyrene Background, Please Help?

[cardinal sinner]

I dont think that sealant can be used under water

 

[ptyson21]

I dont think that sealant can be used under water

Do you know what can be? somethin that aint £20?

 

[mollymoo]

I dont think that sealant can be used under water

Do you know what can be? somethin that aint £20?

hi i bought some aquarium putty(extra sticky)and it worked a treat in my wet tank it cost about 5.00.