I'm using the Labs Edge Damage node to chip edges of my geo to look like concrete. I cannot figure out how to use the mask function.

This is what the doc says link here... [www.sidefx.com]
Mask Attribute - Use an attribute to remove damage.

Can someone please tell me how to do this. I do not want edge damage on all the edges. I would like to somehow pick edges, vertices or paint a mask to remove damage. Whatever is the easiest.

2nd question, it doesn't seem to chip all the edges to begin with. My geo is clean. Does it work on edge loops, hard edges?

Thank you!