I just got a new Mixing Elbow in the mail for my Yanmar 1GM. I reveled in how nicely painted it was, all over. And I thought I ask, should I file off some or all of the paint that is on the side that mates with the engine.Its so smooth, it feels like when I goupe it up with a a seal and selant, I will not get a good seal.What do you guys think. Leave it smooth with paint, or rough it up a bit?