Thermostat Housing

Well this will be the third time I am trying to fix a coolant leak from the thermostat housing. Since I am going to have it apart I figured I would replace the stat with a 180 degree, same as what I had previously. Got it from Advanced Auto and its in a Car Quest box and says made in Israel......How awesome is that? Anyways hoping the third time is a charm. Just to clarify the correct way to install it's gasket then thermostat then housing? I'm trying the permatex made especially for this application.
i always take a piece of sticky back sand paper stick it on a flat surface and slide the housing back and forth on sand paper till surface is smooth and flat, if housing is chrome remove it from the surface.