No factory undercoating on Canadian models. It was applied by the dealers.

I did both on the front, as 26th-Z has suggested.  Truck bed liner went on the front as a stone chip protective layer - except for the shock tower as I did not want to encourage any moisture retention.  The tower was first coated with POR-15, then brush painted in body color,  The rest of the area was sprayed in body color.

I realize that body color is really the correct method but I went black because I didn't want to see bright yellow from the wheel wells around the black tires. Final body color might influence the decision. A darker color in blue or green, I probably wouldn't have bothered