Thanks.
Ideally I would like to primer, filler, primer then continue on with the project before final paint.
What I'm concerned with is grease/oil on the primer before color as I install mock up the engine as such.
Should I be able to clean the primer well enough to not worry before color? I have a lot to do yet and do not want to worry about color in the engine bay but would like to get things smoothed up and protected from the elements.