Joey,

I did once glancing shots on a Panther Ausf.D:



I used my soldering iron's tip to melt the plastic.

I first figured out how many bouncing shots I need to recreate and from which directon each of them was coming.
Then drawed the impacts with a pencil checking vs. available pictures of actual dents.
Copied each of the "impacts" on a piece of styrene, heated the soldering gun and did each "impact" several times till I was happy with the outcome.
Then did the same on the glacis.

My advice-if you decide to use the soldering gun method-is:
-do not overheat the tip(plastic needs lower temperature to melt than solder)
-keep control-do not try to achieve the "impact" dent at once- better add small indents within the patern with a series of quick tip touches, than overdo with a big push.

HTH

Ther are several youtubes on modeling tank damage using the soldering iron method. Practice first or it can look fake. Look at photo's of actual damage to understand what the final effect needs to look like. Don't over do.