OK, so my overflow jug has a small hole in it. This isn't a problem until it gets between half way the cold and hot markers. Any ideas to fix it? I thought about putting some clear silicone over it but wasn't sure if the hot coolant would wear it off.

get a new overflow

Do like in post 1. If it doesnt hold, do like in post 2

For a quick fix try this.
http://www.homedepot.com/buy/paint/a...l#.UCJ4dfZlQ3E

Put a small screw in it if appearance doesn't matter.

Buy a new one!!!!they cost like $25.00

I didnt know they were that cheap! Thats probably the cheapest thing I am going to find for this car. I am doing a complete restoration but with that being said, I butchered alot of things on this car when I was younger and regret it.

http://www.moderndaymuscle.com/inc/sdetail/205/770

Hell, if you're trying to pretty it up, pick up one of these baby's and mount that in there. Looks hella nice for under $100, and won't get all skanked up with age like plastic ones do:

http://www.summitracing.com/parts/CTR-80-210/?rtype=10