Here's what I've done.

I layered clay along the rough edges and areas to give a smoother surface. Then I spread hot glue over the surface of the clay to give a paintable surface(yes, you can spray paint hot glue...).

Pictures:

All sorted out.

Tip: If you put an ice cube on freshly poured hot glue you can quickly spread it while it quickly cools. Soldering irons work well for spreading hot glue.

Thanks for the help guys!

Very interesting. I can't wait to see how it looks with a coat of paint.

Hopefully "Streamlined"!

Will be doing many coats.

here's a cool idea: when you paint, you can do a base coat of black, and then clear coat it. Then you can use plasti dip and make painting easier/cheaper. I use it on my car rims alot.