Once the chocolate has chilled down to 81°F, place it back over the double-boiler or microwave it again, this time at 15-second intervals between stirs, and bring it up to between 88 and 90°F. Let it sit in that temperature range, stirring it vigorously with the spatula for about five minutes or so (you'll need to place it back and forth over the double boiler or find a good warm spot in your kitchen), and it should have formed enough good crystals to now be ready to set, dip, or pour.