I did it first boo-bo on NTM camper need advice

Ok took our 2002 Dutchman aerolite cub on its first trip got in home ok pulling into storage facility took my eyes off side mirror talking to wife caught driver side corner. I thought I got off easy and just took off the marker light , No somehow the yellow pole that protects the code entry caught the side taking a 4"x4" inch of fiberglass off the wooden wall and buckled. I was able to fix the buckling after taking out some of the splinters . I covered with good old duck tape till I can make repair in a few days when weather improves. I saved the small piece that came off. Question can I sand area around and cover with fiberglass cloth sand and primer or do I need to use Putty over the fiberglass. I know it won't look like it came from factory but want it to at least look nice . Thanks for help . I picked up fiberglass repair kit by Bondo and primer for now