anyone have bondo tips?

When I use cardboard I use the glossy sided stuff......like from something I bought at the store with the picture on the box. Cut it up into pieces for use. I then throw it away.

I agree with Barracuda 64. I prefer to work with fiberglass. At least for me, it doesn't give you the filler boogers as much on the sand paper, which can piss me off when I gouge my work. And it's strong and easy to work with. It's also easy to sand with 80 grit for starters and working finer as you progress with the project. Here is a pic of the hood me and a friend finished a couple months ago. I vote for fiberglass. Don't get me wrong Bondo is a good product and works well when used properly. That's my two cents.

Take your time and make sure it is perfect before paint.