I'm sorry if this is the wrong place to post this thread but here I go anyway..

My fixed gear's chainring bolts get loose every once in a while and so I gotta tighten them up every few weeks or so because the creaking just gets really annoying and I feel like I'm gonna break something when I ride. My bike is four months old (Dawes SST) and I had to tighten them like three, or four times. They're fine when I tighten them but now I can't tighten one of the bolts because the bolt is either rounded off or stripped. My allen wrench/key/whatever won't fit in there anymore. I feel like I need to replace all of them because all of them look and feel pretty weak.

I think steel is a better way to go even though it's heavier because it's stronger and strength what I think is essential for something like this but I see that people use aluminum and have no problem.

Three questions:
1, How the heck do I get the screwed up bolt out?
2, Steel or aluminum?
3. What in the world is loctite? I see that a lot on this forum.

Sorry, I'm still a noob trying to learn.