Trunk Gutter holes

There are two small holes in two different places in my Darts trunk gutter each about the size of the head of a striaght pin. Just big enough to see light through with a flashlight underneath or water drip after time.

How is best to patch them?

A body shop states they have a spray sealant that they could apply underneath that they say is bullet proof or do it myself with JB Weld or something else?