For these repairs I used a two part epoxy putty called Magic Sculp, or you can also use traditional composition. Depending on the area being replaced you can either press some into the moulds made earlier, let it set, then trim to fit the missing area and glue in place. The other way, which I used here was to guess the amount of putty you will need, put it in the damaged area and then use the mould to create the impression.
