how to get finished fiberglass product?

Ok i am wondering how to get the finish if the fiberglass to be glassy and nice i kno you have to bondo it but like what do u do after u paint it? and what is the best strechy material to use to cover the box before applying the fiberglass matt? 2003 Chevy surburban

anyone?2003 Chevy surburban

https://www.the12volt.com/installbay/forum_posts.asp?tid=59138&KW=grill+cloth after u paint u clearcoat the project and buff the project with a polish...dont use wax...if your unsure, some brands will say 'paint shop safe' or something similar on the back to let u know u can use it on freshly painted projects. be sure to follow directions on all the cans. hope this helps