You can still get greases that are applied in liquid form but they now tend to be in spray form. I personally do not use silicon oil or grease, it is fine until you need to repaint your boat, it forms a film that is almost impossible to remove, even cellulose thinners has no effect and any paint applied fish eyes and separates, there are dedicated removers but we tried one on a contaminated bike frame which had been blasted, with poor results we had to treat it several times and had to reblast it, we discovered silicone grease had been used in the bottom bracket.
Keep silicone away from any surface you may need to paint.

I used to use Liqui-Grease which was a clear liquid which solidified quickly leaving a grease filled whatever.I think it was silicone grease in a solvent which evaporated. No longer available as far as i can see but silicone grease diluted with meths might work. Great for chains and bearings on a bike so well enough for a little prop shaft. Very low drag too Seems to soften with movement.👍

Hi I am using a mix of Teflon bike grease and a teflon based oil Teflon is non hygroscopic unlike some car type greases and have a low friction level hence low wear. Lithium grease has the same properties and is excellent, all of the suggestions are fine and it comes down to personal choice at the end of the day Teflon grease and oil are available in this country through Wilko's and halfords (own brand. half the price and just as good) Out of interest I make my bushes from PET plastic, acetal is similar, plastic can be lubricated with water as well as grease and is often used in full size propshafts the Queen Mary carrier for example. happy 2019 to everyone.😊

I also use the ProBoats Marine Greaser!👍
It works well for me!😊
And the grease stays where you put it!😉
I've had no problems with it so far....😁

I use White Lithium Grease in my stuffing tubes and on both plastic and metal gears. I build my own stuffing tubes for my 3/16" shafts using bronze bushings from the local hardware store. They insert into about a 3/8" brass tube thereby giving a reservoir for the grease. Does not seem to breakdown at all, has a nice viscosity, does not damage plastics and I have read will tolerate high heat. Local auto parts store sell it for about $6 in a tube that lasts me for years. Just my experience..... Joe

Hi All
I use silicon tap grease as it's waterproof and add a bit more after each outing.
Strip down, check for wear once a year and regrease.
Started using Teflon bearings for the lower bearing which are holding up to the brushless motors.
Canabus

Greetings from Australia and Happy New Year.
Hi Steve
I have always lubricated my shafts with a 50/50 mixture of car bearing grease and sump oil Thinned to a consistency to be Forced into the tube via a syringe.
This seems primitive but I have never had a problem. Top up when you think it needs it. Some would shudder at this but works for me.
Regards Sid

Fill it up with Castrol or equivellent grease and once a year repack it....got boats with grease from over 5 yrs ago and they still as smooth as ever and dont leak water at all.......went through them over xmas for 1st time in years NOT a single mark of wear and that includes a couple of fast boats as well....Had a look at a boat that was last on the water 7yrs ago still with the original grease in it and still was as fresh as the day I put it in.......if your boat is using Oil from an oiler then the shaft will be furbarred and staining on the underneath....really no need for oilers as long as you have put enough grease in it...OIL will wash the grease away

I have always used wheel bearing grease. I have a brass tube fitted to the prop shaft which is the same diameter as a grease nipple so slides into the grease gun Yours Brian

I have changed over to the ProBoat Marine Grease.It comes with an injector that screws onto the tube.Very happy with the product.Just one idea.