Although the electronics inside your RC boat may be waterproofed or sealed up, sometimes water still gets inside parts of the boat where you don't want it to be. A friend who owns the Traxxas Blast, a hobby-grade electric RC boat had this problem.
A slight gap where the canopy of the boat attached to the hull let water into the boat. The quick fix? A homemade seal made of silicone.
Don't just squirt a line of silicone around the gap -- you still need to be able to take off the cover to get at the internal parts from time to time. Instead, remove the canopy and run a very thin bead of silicone around the rim and let it dry. When the canopy is put back on the hull it forms a tight seal that keeps the water out.
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