Unless you are pretty compitent at tunning, I would recomend that you take them to a shop. If you were going to repair them. 1st cut out around the core shot with a stanley triming knife (make sure you 'under cut' so that the repair has less of a chance of pulling out). Clean up the area of debris, and make sure it is dry. If you have base weld then use that, if not you can use p-tex. Fill in the area by doing small layers at a time, let the p-tex/base weld dry then put another layer on top of that until the gash has been filled (Be sure not to let any bubbles if the repair or else the repair will pull out, or leak water into the core). Once the repair is filled then use a panzar file to smooth the repair with the base. Once you get the repair flush, then you wax em and go fuck em up again.
just because there is a goalie in the net doesnt mean you cant score