I have almost completed a scratch-bulit model of P&O's first post-war liner - Himalaya. I have chosen a scale which is probably wierd for model ships, being 1:87, but it fits nicely with appropriate dock scenery and other models (railways, cars, etc) when it is to be displayed statically. It is a working, floating R/C model first and foremost. I have built a number of scale models before, but nothing quite this size. The all up weight of the of the model when ballasted to the correct waterline is around 40kgs. In the water, this weight causes significant ingress of water through the prop shafts, and I probably need to pack the shatfs with grease ( or some similar enviromentally friendly substance). Normal oil is only partially effective. Any clues on how I can force grease in the prop tubes? There are oiler extensions soldered to the tubes, but I'm not sure how I can get grease into the shafts using these. I have tried removing the prop shafts from the tubes, filling the tubes as best as I can, but inserting the prop shafts just pushes the grease back out.
I would welcome any advice.