Brian,
Lot of posts on this,however I used JB Weld on mine. Vee out the area if possible. It sands a little hard but looks OK. Still haven't totally finished. I'll finish with Icing prior paint. Other options I've heard of are Eastwood makes a product,POR 15 epoxy bars, and super glue works on hair line cracks. Pics below.

Dan
http://rides.webshots.com/photo/2036333900071274430HANLJn