It's sea water that's the killer. You have to be quick. You can wash what you want with no effect. But you need to dry it out thoroughly. The only thing with the liquid silicone is, it stinks & its there forever mixed in with the Solder if you replace parts. It gives a seal on contact & dries quick, so a very thin coating on the lipo & pigtail connection before a flight over water will help even more.
Or I would suggest using a condom
around the battery as the cell connections are not waterproof but just covered by shrink wrap. You could waterproof them & then re-wrap the lipo. The Johnny is quicker & looks more
.
Some micro switches like boot buttons & the like, if the silicone get in these, there is a good chance it won't work so would be best if you put a well placed blob of hot glue on these so it can be peeled off later.