Finishing fiberglass?

Once the fiberglass has been applied and dried, does the fiberglass get sanded or does body filler get added and then the body filler gets sanded, I know that body filler must be added to be able to get the smoothest look but the question was if the fiberglass has to get sanded before the body filler get's added, thank you and if any ideas can be given to me, I'll appreciate it, thanks

If i were you, look back at prior posts to get your answer. Every question I think of has already been answered in prior posts. You might have to look back a couple or more pages. but you will find your answer. Let me look at some https://www.the12volt.com/installbay/forum_posts.asp?tid=12235&PN=2 https://www.the12volt.com/installbay/forum_posts.asp?tid=11833&PN=2 I hope these posts help