Thanks for the tip
Here is a before/ after comparison
As you can see the silicone joint was needed. I used it just about everywhere: on the sensor cable plugs once the cable installed, on the motor holes, in the BEC (I completely filled it), all around the ESC especially in the wires plugs area, around the servo, around the receiver. I had absolutely no failure under the rain, the silicone protected everything perfectly. I already cleaned all the electronics and it looks like new
I removed all the mud before I took the pic, I should have done a pic just after the race but my hands were full sorry