RE: Sig SE on Floats
Blue Skies..........I never had a problem with the aileron servos either. I assumed that since they were on the bottom, any water that splashed on them would fall right off. After a couple of seasons, I did remove the servo arm, and monokote a patch over the servo bay with a hole punched in the middle of the patch for the drive shaft. can't see how significant water could get to the servo now.
The main waterproofing that I used on the SE was a strip of Scotch Magic Mending Tape (I think that's what it's called - the clear tape with not too much tack) around the front and side joints of the radio access hatch. Never saw any water inside. Having said that, I think the Corrosion-X idea is really good, particularly if you ever go near saltwater. Lost an old Orbit rig to corrosion in less than 15 minutes years ago.