Yes, I use it on large diameter inrunners pushing 4-5k watts continuous. It allows a 3k rated motor to handle about 20-30 percent more power via better heat dissipation. There are some really interesting scientific tests that have been conducted by Justin from ebikes.ca on it. There are a variety of brands. However, I don’t think the ferro fluid will have ANY of the anit-corrosion properties of corrosionX or ATF.
As for ferrro It’s realy good advice I will use it on other projects. But for flipsky I found wurth corrosion protection spray. It has corrosion inhibitor and is good in salt water. I will spray it inside and after I will fill it with some ATF, but mineral maybe castrol transmax.
Today test was fully successful 
. Above expectations! Many thanks for this forum and to all enthusiastic people which are willing to help and share their ideas and knowledge…
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Hello, if you will make search on forum you will find few links from guys where you are able to buy it in EU, fo example in Germany, I think shipping for you will be less than 15eur.
When I’m trying to find analogs of corrosion x I have searched by corrosion x by MIL-PRF-81309H. requirment. In my country we have no such requirment but I have found local products with similar control performance requirement.
For example, MIL-PRF-81309H are some military grade requirment (?), but in your country something similar could be MIL-PRF-55555.
I already asked earlier about analogs but didn’t receive any answers so even thought to create separate topic for this question. Each month some one asks help about this Corrosion
See my post here
So please share your opinion about Wurth later because it’s only one of products I able to buy in my country also, except Corrosion X
PS efols are legal in Montenegro and Croatia? For me only these counties available by car due corona virus and due high water temperature in winter (12-14C) we are planning visit country in February/March if corona pandemic goes down
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I am planning to use CRC technical grade 3-36. Its a lubricant, corrosion inhibitor, non-conductive… And cheaper, and easier to get than CorrX.
They also mention protecting motors as one of the applications for 3-36 tech grade. Probably not in the way we do it, but its a promising spec anyway.
Edit: just applied the 3-36. The product seems excellent, low viscosity but sticks well to surfaces. I used 80ml.
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Corrosion X is available from germany, resonable shipping in europe.
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Thanks for advices. But my experience with efoil at sea is only one day. Today I inspect the board and didn’t see any problems from salt water. In a few days I will open the engine to see if there are any signs of damage. I tried several times to order from GB corosion x but each time it was returned from customs. In the meantime, I found crc marine in a nautical shop and ordered crc hd and crc 6-66 1l. For my first test I sprayed with wurth corrosion and filled it with atf. In Montenegro all vessels with propulsion should be registered although it is not clear whether this applies to vessels less than 3m with electric propulsion. I think it is similar in Croatia.
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Here’s an interesting comparison of products similar to corrosion X. Fluid film which is made in New Zealand appears to be a winner. Has anyone used this product.
http://www.fluidfilm.co.nz/fluid-film-why.html
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Yesterday during the test ride, I noticed that I opened the hatch lock with my knee. I was lucky and water wasn’t leak inside. Does anyone have solution how to block this type lock on hatch?
Maybe something could be 3D printed to cover the latches to stop them from lifting.
It’s interesting that you’ve had success this this type of hatch, even with a latch coming undone. Many have reported this type of hatch to have issues with leaking. Could share the brand of the hatch and if you needed to do any modifications to make it waterproof.
With orginal seal I had problem even with small amount of water. So I removed orginal seal and created 3 new down an one up. I hope you can see it on image. Also inside I coated with polyurethane. As for lock I added silicone oil on rubber inside and filled holes where is screw with glue. Now is pretty safe except that lock can be opened unexpectedly.
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Nice job… Thank you for sharing. 
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Some updates… I figured that I am mising handle for battery and board and I added it…
!
As for anti corrosion and lubrication I recieved crc and it’s high viscosity oil…looking promising.
And resolved problem with unlocking hatch.
!
Finally some time for enjoying
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Ajmo lagnoooooo! Cestitke!
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Hvala komšo! 
Navrati na:beers: do BD.
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Logs recorded; flipsky 75200, and 120kv, chopped 5inch flipsky propeller to 140mm without duct and clone v100, my weight 90kg.Thanks @Ackermann for advice to remove pump. Temperature wasn’t go above 35°C…
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