I've used Collonil on my paddies - no problem. I didnt drench them. Just a light spray form about 40cm away. Did that once a day, 3 times. All good. Sometimes I get rain spots on my paddy hobo and large betty. They are sprayed too and the drops disappear later anyway. I think the leather is more 'naked' on those bags. It feels less coated that my other paddies. But again. Rain drops disappear, no issues at all. I mostly spray them to protect from coke spills etc. When you have kids....