I haven't found any coatings that make a significant improvement over a clean hull. Hobie Protectant probably works as well as anything (after cleaning). I don't know if it actually benefits speed, but it doesn't hurt. Streamlining helps at least as much and you should do both.
Your Drive is the most significant component in speed by far. Seating and leg position are also very important.
Here are a couple of links with more specific details:
viewtopic.php?f=11&t=11072
viewtopic.php?f=11&t=28305&p=115423
Additionally, I suggest you experiment with some small weights in the bow. Dumbbells work well. Surprisingly weight doesn't slow you down much on the water, but the boat's attitude in the water is very important. Many of the Hobies have a tendency for the bow to raise with speed. This shortens your waterline length and increases your wake drag. The weights counteract this tendency. How much to use depends on your speed, weight and boat model. I'm at about 185 lbs and can pick up about .1 MPH with 5 lb in the bow of the Adventure or about .15 MPH with 10 lb. in the nose of the new Revo 11. I would suggest you experiment in that range with your Revo 13. Have a friend or acquaintance take several pictures of your bow position while at your expected racing speed (maybe about 5 MPH with the Revo depending on distance?). I don't know how this concept applies in the ocean or in rough water, but it works great in relative smooth water and light to medium chop.
You'll find that you can out-perform stronger competitors by paying attention to these details -- most people overlook them.
Finally, know your race course, tides, currents and weather. Running a smart race pays off. Good luck and let us know how it turns out!
