The answers to the clues below will have something in common.

1. Add insult to injury
2. View with skepticism
3. Boardwalk buy
4. Honest, decent, hard-working people
5. Sailors' talk, perhaps
6. Potassium nitrate
7. Capital of the Beehive State
8. Natural hair color with some gray

Answers:

1. Put salt on a wound
2. Take with a grain of salt
3. Saltwater taffy
4. Salt of the earth
5. Salty language
6. Saltpeter
7. Salt Lake City, Utah 
8. Salt and pepper hair