You want underbody wax, if feeling adventurous buy the kit to inject into the cavities as well.
Stand your OPEN tin of wax in some warm water before hand, makes it easier to apply. Plenty of plastic sheeting on floor and paper overalls for you, trust me it gets FUN!!!
IF IT HAS A HOSE THEN IM YOUR MAN
BETTER TO BURN OUT THAN FADE AWAY!