I am not sure if my a arm bushing (polygraphite) recieved a "liberal" amount of grease before they were installed. After reading more on this site, I'm concerned they will squeak a lot (hasn't been driven yet). Someone suggested using a silicon spray, or do I need to take it all back apart to apply more grease if they do squeak?
Thanks!

I've never heard of the Silicone spray for the bushings. Ideally you should remove them and grease them up. I know it's not what you want to hear, but they may not squeek at all.

grease or spray, it doesn't matter as they both will wash out over time if long term squeak protection is your goal. The grease is for installation.

Several people on this site have drilled the insert for a grease fitting. If you have access thats the way to go.