How much will my insurance increase?

Swiped a bumper, didn't do any physical damage but it did burn the paint off to the plastic in 2 small spots. The bumper already has paint imperfections before hand, but I am guessing my insurance company will just pay to repaint the entire bumper. Shouldn't cost more than 300 MAX. Just wondering if anyone familiar with this stuff can guestimate how much my insurance will increase.