Palum
what Suineg set it to
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Fill hole with epoxy and hit the area with sealant spray?
Without seeing it, it's hard to really have an opinion on the damage itself. If it was a small cut/puncture on the underside of my car, I probably wouldn't worry about it (since it's got a bunch of scrape marks under it already).
That said, I've taken the front clip off my car, and it wasn't tooooo difficult. Depending on the panel, it could be as little as 10 or so screws and maybe a few new specialty body clips (when you put it back on).
I think the proper repair would be to pull the panel off, then use some filler with a backing material to keep it in place, especially when its going to be taking some abuse, being under the car. There are a bunch of YouTube videos on doing body work. I also wouldn't worry about painting it unless you're looking to impress your mechanic, but if the repair is in heavy contrast and you think you will somehow see it, you could use a rattle can of plasti-dip, since it's 100% removable w/o marring.
This is what it looks like.