Which primer?

[andeep]

I need to paint a panel on my car. The panel has been fully prepped, but there are some areas of bare metal, some areas with some filler, and some with existing paint.

Should I prime the entire panel with etch primer? Will the etch primer stick to the filler and existing paint?

 

[steveo3002]

only need to etch the bare metal , although its fine over keyed paint etc

usual way is spot prime the bare metal only , then after its flashed off for 10 mins or so straight on with 3 coats of high build