For compounds with a hyphen, use a hyphen with both prefixes:
short- and long-term solutions full- and part-time consultants
For compounds that would normally be set solid, use a hanging hyphen with the prefix of the first term:
pre- and postnatal under- and overestimate
Do not use hanging hyphens for base words with different suffixes or last words, because they are usually difficult for the reader to understand:
lifeguard and lifeboat training not lifeguard and -boat training
he was caught red-faced and red-handed not he was caught red-faced and -handed
