Leave the e-coat. You have a multiple choice regarding paint proceedure.
You "CAN" scuff the e-coat with a red scotch brite and paint right over it, but not best choice. Cheapskate method.
Normally - shops scuff the e-coat with a red scotch, remove imperfections with some 220 or 320 paper, then use a non-sanding primer sealer, then follow with selected paint products.
"BEST" and most expensive, you can sand e-coat then follow with a catalyzed primer surfacer. Wait a day, sand again, begin selected paint process(es).
I'm guessing you are going to paint it entirely before installing it. If not - at least paint the jambs before installing.
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