It was really easy. One small bottle of 1000cst oil was only $3.49 at the hobby shop. I probably spent more on gas getting there and back. The store is about 25 miles away, but I was already in the area for something else.
It was really easy. I put the oil bottle in a cup of hot water for about 10 minutes. I took the band and bezel off. Then unscrewed the caseback and took it off making sure not to disturb/damage the rubber gasket. I pulled the rubber thing off that goes around the battery. I made sure I did not lose the little spring. I then popped out the module and pored a small bit of oil in. I snapped the module back. I made sure not to touch the inside of the glass or to touch the display on the module. I poured more oil all around the module to fill the case the rest of the way. I put some oil on the caseback and screwed it down. Then I washed off the watch and dried it. Then I discovered I did not put that rubber thing back in around the battery. D'OH. So I unscrewed the caseback again and installed the rubber thing. I added more oil on the caseback before screwing down again. I also discovered you can snap off the rubber/plastic thing that goes around the caseback on the Mudman. This made it a lot easier to clean.
I only had 2 visible tiny bubbles about as small as the 0 in 200m written on the watch face. They have since disappeared. I let the watch sit dial up all night to see if any air bubbles appeared. None yet. There has to be some air somewhere in it I did not give the module a lot of time to bubble out before I closed the watch back up. Should I let some air in? Or should I just put it outside in my black closed vehicle in 90+ degree South Carolina summer heat and see what happens. It is a user/beater watch. I am leaning towards heating it up and seeing if it cracks or bursts open. It will be fun.
This Mudman is negative display. It makes the screen look great. It looks a lot more crisp. If the glass is really clean sometimes it looks like there is no glass there. I will get some pics up before I heat it up.
That is all.