Final answer:
The PN should ensure to rub all surfaces of the hands with the alcohol-based rub and continue until the alcohol is dry for proper disinfection.
Step-by-step explanation:
After applying alcohol-based hand rub to the palms of the hand and rubbing palms together, the Practical Nurse (PN) should proceed to cover all surfaces of the hands with the rubbing. This includes the backs of hands, between the fingers, and under the nails. Following application, the PN should continue rubbing the hands until the alcohol is completely dry, which ensures that the hands are properly disinfected.