>I don't think that it is any type of tar. When Ron Bowman was in Canberra a
>few months ago he emphasised the use of this particular type, 'ormonoid'
>(sp??).
Ormonoid is a trade name - any large hardware store (in Oz) should have it.
I don't know if it's an Australian product only or if it comes from or is
sent to other country. It is a brushable bitumen paint/sealer meant for
drinking water tanks, hence nontoxic (we hope). I've used it for non-fish
applications only - it's easy to handle if a bit grubby. Use cheap brushes
and other tools, you'll never get them clean. Also as Scott said, I'd be
putting some expendables like gambusia in to check the water first.
Cheers
Chris Howe