I used the same stuff that Terry used on his prototype to get that color. I hope I chose the right one cause it looks really good.
What I used was Delta Ceramcoat Acrylic Paint. The color I used is "Lisa Pink Rose Lisa Opaque". You can get it at any material shop or hobby shop. I got mine on sale for 98 cents! I also got some white for Animals teeth that I am planning on rebuilding later on.
When you pu it on, you might have to go over it again when the first layer dries. Due to the lip being material, it is best that you go over it again to get the full effect. I also thinned the paint a bit to give the color fading out towards the mouth to blend in a bit.