We experienced some dock rash from our fenders last winter on our dark green hull. Reasonably easily buffed out in the spring. On the advice of others, we added cloth fender covers (Polyform brand, like the fenders). They have been a good improvement (those of you in salt water should beware the abrasiveness that accumulated salt in the fabric may cause).
Where we moor, however, we occassionally get hammered by current and high wind gusts. So we decided to do all we can. We have just added new dockside fenders (some would call them bumpers) that permanently attach to the dock. No need to drop our dockside fenders coming in, or have them over the side while in our slip.
The product has an excellent reputation (I'll leave you to do your own research). By all accounts, the cover material will not mar the gelcoat at all. Our experience so far proves that out. Plus, we find that the boat does not bounce in and out so much, but seems to "float" much more gently alongside the dock. The bumpers seem to be more "damp" than fenders, while still providing good "percussion." They are not inexpensive. But we think they will last a long time and will be worth it. For anyone interested, the product is "Nomar bumpers" and the website is
http://www.holmesms.com. (I hope it goes without saying that I have no connection with them. As always, this is just one Tugnut to the others, trying to pass on information and experience).
Gini
(One additional note: this is a family business located in Roseburg Oregon. I actually bought mine and picked them up there. Really nice folks who go the extra mile to explain everything about their product, how to install it, what to expect, ext.)