Painting flexible plastic

If it is either vinyl or polyethylene, good luck.  Paint adhesion to polyethylene is terribly poor, and with vinyl almost any paint reacts with the plastic and stays gooey forever.  There are folks I know who paint it okay, but they use a special primer- I forget now what it is.

Hi ;

 There is a product marketed by Rust - Oleum . It's made for vinyl furniture and patio pieces .It might work .They say you can spray it right on with No Primer !  T.B.

You might also look at automotive paints for plastic bumpers & other flexible parts.