Use extreme caution using DOT 5 silicone fluid in systems that did not use it as a factory fill. You'll need to verify that any rubber components in the system are made compatible with silicone fluid. Most parts made for passenger and light truck oem replacement are made for use with DOT 3/4/5.1 glycol base fluid, and will degrade if used with silicone fluid, which will cause leaks in the system.
As far as painting the brake hardware, it really isn't necessary, though painting the backing plates as Bill mentions will cut down on corrosion on the shoe slide points and keep the brake dust from sticking. The springs will fine w/o paint. The only reason you see them painted OEM or in aftermarket kits is for spring coding, not protection.
