3.5 grams of thermal paste usually works for at least 10 or 12 applications. It's not toothpaste. The goal is to use as little as possible.
If you use too much it will come out the sides when the cooler is fixed to the motherboard. Hopefully it's not conductive because if it comes out and gets on the motherboard it can cause shorting if it is. I'm not sure of the exact model of the paste to check and see. Hopefully someone else will post here that knows.