Tank painting?

[safety4fire]

[kellehar]

I use testers model spray paint dark blue. only takes ten minutes to do it.

[safety4fire]

If you plan on keeping your tank, do it, if not I would tape a backing to it instead.

[Pescador]

You can spray paint pexi and attach it to the back. It's easy to remove to see in or for cleaning the glass. Graduating different shades or even backlighting can help add more of an illusion of depth.

Waterproof hockey shinpad tape works great to attach it.

[Ruth]

You can go to an auto detailing place and buy some of the stuff they use and just stick it on the back - it peels off pretty easy. It's pretty cheap (they actually just gave it me) That way you can try a couple of different colours and see what you like best. It a PITA though if you have bulkheads back there.

[Kabong]

For spray painting Krylon fusion works.
I've also heard of Tremclad being rolled on. (but have not tried myself)

[Jason McK]

I just used Blue Spray paint from HD.

I was kinda not looking for stuff that was special for Glass, because if I didn't like it I wanted to be able to scrape it off. It has been fine

J