Rust under spoiler

[99 Protege LX]

I found some rust under my spoiler and ground out all the rust and repainted. Now i wanna reattach the spoiler and am wondering if i should out some silicone around the bolts that go through the trunk just to keep water out? Any help? Thanks!

 

[Guilfordfall]

Well if they use salt on the roads in the winter, then your going to get rust no mater what.
But some silcone grease will help prevent it.