Stupid me... I ran my cage into my lawn mower in the garage on the weekend. Now I need to repair a small ding the size of a quarter on the front fibreglass spoiler. The damage is just on the surface and didn't go through the glass. Does anyone know if you can use Bondo for that? Will it stick to fibreglass and if so is there a specific grade that I have to use? I was hoping I could just patch it up and re-sand it down. Thanks.