[rktman]

But, but, but......what about contaminating the erf due to those ruptured paint cans?

[Cicero]

Choose biodegradable paint.

[Beagle8U]

“But, but, but......what about contaminating the erf due to those ruptured paint cans?”

No, the bears save the erf by growling and rolling around after biting down on the paint can, cleaning the erf with their fur in the process.

If no bears come around you collect the cans for later use, with the erf no worse for the wear.