'Fish Safe' Paint

In my new project that I am planning, I want to try a HM filter. Some of the plastic pieces that I will be using are white, and I would like to paint them a more 'natural' color. Is there any paint that is safe to use in tanks or is there some way a painted object needs to be cured to be 'fish safe'?
I remember reading somewhere before that there is a brand that is safe, but can't remember the name.
TIA