Yes, it possible, but it again depends on the thickness of the drywall mud patches. Using a hairdryer can only be energy efficient when drying thinner layers. To do this, aim the dryer a few centimeters away from the curing layer and turn the appliance on. The hairdryer not only raises the temperature of the targeted area but also increases air circulation near the place. These two mechanisms fasten drying of thin layered drywall mud.