Pour...on dry hair. Wrap with plastic wrap or cover with a good shower cap. Leave on for 20 minutes. Wash as you normally do. Bonus: Black strap molasses, taken internally (about 2 tsp a day) can help clear up acne and strengthen hair and nails. In fact, a couple of studies have shown that daily ingestion of black strap molasses may, in fact, help alleviate hair loss and even restore hair.