I have metal (presumably aluminum) drip edge along the perimeter of my
roof and will be priming and painting the fascia and drip edge
tomorrow. The drip edge is currently painted drak brown and the new
color is off-white. The house has already been pressure washed.

Do I need to sand the drip edge or rub it with steel wool prior to
priming/painting, or will the primer (Sherwin Williams A100) stick
well to the existing paint?

Thanks.