Fibreglass repair

[Josh]

Hi all

I bought my rear arches 6 years ago, finally got round to fitting them (this project has been dragging a bit!)

There are some large cracks, where I assume air bubbles have propagated? There are also various other hairline cracks. Can anyone suggest how I should go about fixing these?

I also recently painted my first fibreglass panel - the scuttle. It wasn't until the primer went on that I noticed a small crack. I decided to press on with painting however because at this stage I'm not too bothered, I just want to car on the road! For future reference however, how should I go about fixing this?

Thanks!
Josh