So, i am building my own pontoon rc boat. I was aondering though when it comes to electronics, are their certain waterproof servos and receivers or do you just do the best you can to keep water off of them?

The most common solution is to keep them as dry as possible by location and some sealing of the cases. While sealing a servo can be done (partially anyway) the easiest solution is just to mount them in such a way that they don't get wet. Sometimes that means a sealed compartment and control rods exiting through a 'boot' or seal. Some boats, the slower ones, are much easier to 'water proof' than the faster ones, not as much 'splashing', etc.
Receivers are another one of those 'sort of' water proofed things. Probably the most common method is by putting them in a balloon or sealed compartment. The 'hard' part is getting the cables into that balloon or compartment for making connections. Not impossible by any means, just not 'simple'. Finding a dry mounting place sort of 'up high' tends to be fairly common. If a receiver is installed never to be accessed again, it's easy to water proof. Not exactly the cheapest option, especially for someone as 'cheap' as me! Oh well...
- 'Doc

you can dip you servos in tool handle grip.


http://www.offshoreelectrics.com/products.php?cat=79

Heres how I did mine.