Silicone brake fluid (DOT 5) doesn't eat paint and doesn't absorb water. You have to be sure not to mix it with DOT 3 or DOT 4..
Here are some notes on it
http://www.team.net/sol/tech/dot5.html
Military procedure for converting to "BFS" (brake fluid, silicone)
https://www.logsa.army.mil/etms/data/A/048941.pdf

-Sam