Call this a wild guess but, after looking at my 827 FLS, I have come to suspect that the "fiber looking surface" is fiberglass "chop" with gel coat sprayed over it. Do a web search for "fiberglass chop" for further explanation. A possible resolution to your problem might be to search for a fiberglass repair or parts manufacturing shop that has a chop gun with which to spray the damaged area and let them take a look at the area you need to have repaired. Matching the color of the gel coat is fairly simple, like getting a custom color paint based on the color of a sample you provide.
I got interested in the subject after writing the above and did a bit of research. Below you will find several links to the makers of Filon, which is used in the sidewalls of RVs. Guess what? The composition is random chopped
fiberglass roving in a polyester resin mix. Bingo!! It seems to be sold as rolls of very thin sheeting (1-1.5 mm,) and is possibly then laminated to a backer board by the RV manufacturer or it’s supplier. (Sidewall delamination, which we have all heard of, would then be the result of insufficient adhesive, or the improper kind of adhesive, between the Filon and the backer board.)
A little research of you own might resolve you problem, assuming that you want an invisible repair. I’m sure Forest River can tell you the color of the gel coat (if you can get in touch with them J
) and Kemlite might provide repair information. I am assuming that the backer board is not damaged.
Good luck and the best of result with your project.