Styrofoam Glue?

I have been working with Styrofoam balls making Christmas ornaments with sequins.
My problem is the straight pins. I have been unable to find any pins with a big enough head to keep the sequins in place. They (the heads) are all different sizes even from the same package. Somewhere I saw that you could use glue. What kind of glue is safe for Styrofoam? As you can see, I am a novice at this, but I am enjoying it! Thank you.