Fixed mine too. I had to use a very small bit of body filler. The local auto body supply store matched the paint (and clear coat). I used an air brush to apply the paint but the auto body could supply it in spray cans as well. Finished with 5000 grit sanding discs and buffed it with 3M Perfect-It polish. Cannot tell it from any distance! PS Hope you are OK.That tank fairing is in great shape! Just smooth it down with some 700g sand paper and then use exact match touch-up paint. I had the same issue and it's now totally invisible unless you're like 6" from the bike.
I believe you want Anniversary Red (DUC002) from touchupdirect.com