If you have the time and staff available the best way is clean the fitting with a wire brush and brush on a heavy duty grease onto the threads such as high melting pint axle grease or use petroleum jelly....the stuff never comes off. The old school ways are still the best....just time consuming, but gives the yard boys plenty to do when its quite.....
There’s a place in Essex called Eljay chemicals who make a scaff Clip lube works just as good as scaffeze if not better and they deliver throughout UK - cheaper too!