Marcata (excuse the spelling if that isn't correct) is a fabric that is embedded together with some type of "epoxy" (although I am not certain if it is actually an epoxy per say) like product. It reminds me a lot of fiberglass in appearance and concept, but functionally it is not like fiberglass. It is very very hard. Your not going to break it like fiberglass could. It is almost impossible to scar, and if you do you can simply rub a wax on it to make it look essentially new.
Just for the record, I have abused one of my knives far too much when rushed...actually using the handle as a hammer to pound in some nails. Each impact did leave a small blemish in the material, but like I said I rubbed it with a wax and those blemishes disapeared. I am NOT ADVISING someone be so impatient of course, but to me the knife I was using simply does not mean anything to me except as a tool...so I used what I had. Today, no one would ever know any different and it is still as solid as day one. I have had that knife for about 5 years of abuse.
I also have marcata on tip overlays on many traditional bows. It absorbs the impact of the string on the tips of the bow when the bow is shot. I have never scarred it.
Ironically, it is easy to sand too.