How to fix resin casts quickly In my previous videos I sculpted, molded and casted Familiar statue from Heroes of Might and Magic 3. The mold was made with many different airvents, but I intentionally skipped them for the chin and nose thinking they were already too large and rounded so that air would escape from there easily on its own. Unfortunately this plan didn't work and some casts have areas of incomplete filling But such issues are very easy to fix! Any epoxy material will work for this.