What should I be using to repair wheel pants. Im thinking I should be using fiberglass tape and epoxy on the inside of cracks. Is this this correct?

What should I be using to repair cracks on the outside prior to sanding? What type of filler?

I will also have to pull and refinish the area around the blind nuts as they are very loose. I havent looked at it that closely yet. Would I be using the same type of filler? Once this area is repaired I would then be redrillng and installing new blind nuts.

Thanks