I'm a big fan of the p-tex repair ribbon that tognar sells:http://www.tognar.com/base_repair_to....html#SVN-CRIB
You lay this in with a 40w soldering iron and it doesn't come out, even next to an edge. It's hard and requires alot of heat to get bonded. Take the 40w iron and spread a thin layer of it in the hole, really working it into the fiberglass, and bonding/melting to the existing base material. Then continue spreading thin layers on while its still hot. Do not go higher than the base, as it is difficult to scrape/plane off - smear it as flat a possible with the soldering iron. Smooth out by cutting with a panzer file, razor blade, or utility knife. I've done dozens of base welds this way, and only had a couple fail. After a stonegrind, the patches aren't even noticeable most of the time. My rock skis have about 5-6 repairs right on the edges, and after their last grind, I couldn't see the welds. This is a far better weld than you can get in most shops, even some of the best ones.