How to touchup paint on factory hard top

I have the classis hard top paint flaking under the rear window of the hard top on the '91 Miata.

Its white under the flaked paint. The size of the flaked off pieces are as big as a pencil eraser head.

Should I prep the white undercoat with a fine sandpaper before applying primer or touchup paint.

Should I apply a primer before applying the touchup?

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Pat
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