If you are using servo motors for any underwater activity, although these hitec waterproof servos are super nice, you don't have to spend 50 dollars per servo. Here's how to waterproof servos yourself in a few steps. I havent tested this at super low depths, nor have I done extensive tests for long periods of time. However, I have made little robot fish that are totally fine after many swim sessions using this method.

Currently, I'm making a swimming robotic snake like this one using this method. 

I've read that people have successfully tried and used the condom method (wrap your servo motor in a condom, basically) but my condom broke : ) when I tried it.

Step 1: Materials

marine grease
Auto marine sealant (DAP works well but another silicon sealant will also work)
Servo motor
o-ring, like this one : EPDM O-Ring, AS568A Dash Number 007
Why is it wrong to use a silicone oring together with a silicone grease ?
How does one know the size of ORing to buy for a given servo ? Do all standard servos require the same Oring ?
Awesome. Nice work! <br>Bookmarked for future projects.
if you try to Plasti Dip is the same but permanet
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