I try to wear the search feature out before posting but I am confused on this.
I am sanding the exterior to bare but will leave the jams and cowel (spelling) original just scuffed with 180....do I need to take great care in not getting any etch or wash primer on the sections not bare metal, Martin & Eric helped me with my plans on the section by section process im using, and I failed to mention the jams and cowl being just scuffed.

so as it stands now I will be...
1. filler
2. scuff cowl & jams 180
3. etch
4. $$$ then replace pass quarter and deck filler
5. scuff existing etch...etch entire shell
6. after it flashes K38 entire shell
sound ok

thanks chris

You can etch the cowl and jams too. The acid in the primer will stick to the scuffed areas as well as bare medal...

You will be fine etching the jams and what not as long as its scuffed