Let us know what they say. I read their website, and it looks like plant life will affect the application, as will muck/silt.
What's the time difference between the Eastern/Central time in the USA and Australia?
Here's their contact information, and a name/phone number:
Brett Nichols
Client Manager
Polymer Innovations Pty Ltd
PO Box 431, Singleton, NSW 2330
Ph: 02 6571 5177
Fx: 02 6571 2505