[Healeys] Bonnet metal work

[Elton Schulz]

Fellow Listers,
I'm restoring the bonnet (hood) on my BJ7. After stripping the paint, I'm
getting metal deflection towards the center of the bonnet. It deflects when I
push on it with my hand, but it then springs back. Is this normal or should I
be concerned about this "oil canning" effect? I'm reluctant to attempt to heat
shrink it.
Thanks in advance for your opinions.

Elton, BJ7 in progress