applying filler

Thanks for tips. I think Im on the right track here. I think I decided to sand again and reapply the Fiberglass filler. I think 1 more layer of this will reduce the chance of cracking the top filler by going to thick maybe? Plus another coat of fiberglass filler will make damn sure everything is sealed up good. Over all it didnt turn out too bad. I do see the areas you are ar talking about in the C pillar and I will sand and reapply.

One reason I'm using the 100 grit on the Orbital is so I dont get myself in trouble and really it doesnt seem to take that much sanding. I have a feeling that with a 36 grit I'd be chewing in a hurry and do more damage then good.