question regarding stock tii spoiler
 

so i recently bought a stock spoiler to put on my car. when i got it i found out it wasnt hard plastic/fiberglass/whatever i thought it was but is infact sorta rubbery.

my question is how do i paint it? from what i can tell it was originally red then the red was painted over with a grey color, but the grey and red are now chipping off. should i strip all the paint off then repaint it or what? if so how do i get the paint off without damaming it?