Here is the problem, I have 5 of these...
http://i18.ebayimg.com/03/i/04/5c/fe/3a_1_b.JPG

When they have water in them ,the sun makes the water go green :-(

I also have two 1500l black barrels, these don't suffer from this problem.

So, I though it would be a good idea to paint them!
Off down the road I went, and bought a 400ml can of Hunter Green
"Plasti-kote" spray paint for £5.95

This £5.95 worth of paint didn't even cover one side on one tank!!
...and lots of light was still getting through it anyway...

Any ideas on a better method, or cheaper paint I can use!
(Could I use normal oil based paint, applies with a paint brush?

I do have a compressor and a spray gun (But have not used this yet, and have
no idea what paint I can use, or where to get it either!)

I suppose I could box them in with wood (WBP Ply?)

Thanks for any suggestions!

Sparks...