Bill Surh of Peninsular Air Services owned VH-REL in the late sixties and early seventies at Moorabbin. 'REL' was indeed an ex cloud-seeder and he also, later,(1970?) had a contract with the CSIRO for seeding, using a Twin Bonanza, VH-CLO an ex Conellan machine. Very little use was made of it in the cloud-seeding mode. I cannot remember why.
I think from memory that the reason that CLO wasn't used much was because it was either being fixed or flying to and from being fixed.
Bit of a "cursed" aircraft.