Tony wrote:
I have a kayak with two indentations. They are from the pressure of the two
supports on the wooden rack where they were stored. Someone turned them over
at the beginning of last Fall and the pressure from the added weight of the
rain caused the indents.
I have left it sit upside down in the sun hoping the would pop out. No
luck.
Any other suggestions would be appreciated.

Try heating them with worklights or very carefully with a heat gun.