Leaving the front plate off the car, got two holes punched through the front bumper which *I think* is ABS plastic? What kind of silicone should I use to plug the holes........Trying to find something not too dark, so I can dab some touch up paint on the finished product. Thanks.

 

You could just dab on a bit of bondo to fill the holes, hope they are not too big. you can scuff the bondo and dab some paint on 'em. If they are bigger, I would suggest long strand fiberglass, one coat sanded down, bondoed over, scuffed, a dab of spray primer (on finger) and a dab of paint.

 

Bumpers are not ABS. They are a TPO. (Thermoplastic Polyolefin) (Been in the plastic business for 12 years) I patched a bumper back in the day and it looked pro. Remove the bumper; lay a piece of fiberglass on the back over the holes. When it dries, fill with bondo. Sand, and paint. Probably easier to just find a new bumper on ebay for ~ $200. But if you're handy, it's not that big of deal to patch it up.