Is it obligatory to re-wet the hands when wiping the head during Wudu if the water dries before completing the wiping?

Wiping the head is a pillar of ablution. If the hand dries before completing the wiping of the head, the Malikis hold that it is obligatory to renew the wiping by taking new water, unlike if it dries during the 'back-and-forth' wipe. Wiping is permissible if the hand dries after the sufficient wiping has occurred, according to those who do not require the entire head to be wiped. For the Shafi'is, wiping three hairs or even one hair is sufficient, while for the Hanafis, wiping a quarter of the head is sufficient.