Hello everyone. I was wondering how do you apply nano oil? When I clean my knives I take them apart and apply a drop of nano oil on each side of each washer. When I get my knife back together it is gritty and not smooth at all. It has been very humid out lately and I notice it happened once after I came back inside that it was gritty but other times I was just opening and closing it. Can you please tell me how to apply it correctly and why my knives are getting gritty?