In order to properly answer your question, I need to clarify some things first. Are you trying to paint your pillars outside of the car or the actual interior pillars? Also by "Interior Paint", are you referring to automotive interior paint or house interior paint? You didn't specify, so eventhough common sense tells me you meant automotive interior paint, I just have to be sure.
If you use automotive interior paint for your interior pillars, it should stick and come out okay. I usually use Rustoleum paints but I have also used Duplicolor. I have sprayed interior panels on cars before both with and without sanding; primering and without primering.
-Without sanding, it looks pretty decent, but the paint scratches very easily.
-Without sanding, but primering before painting, the finish comes out a little better and the paint adheres to the panels a little better.
-Sanding first, but not primering, the finish is about the same as primering and painting without sanding.
-The obviously best method would be to sand the pillars first, then primer them, then paint. The finish is quite nice and very durable. It isn't invincible and still could scratch, but the pant doesn't scratch or chip nearly as easy and won't fade or wipe away much if you need to clean the painted pillars.
Just make sure to use a very fine grit sand paper and do your best to keep even pressure on the sand paper that is making contact with each area of the part you are sanding in order to keep the surface area that is going to be painted smooth and even. Also be sure to give enough time in between priming and painting to allow each coat to fully dry. And lastly, if you want to make sure the paint really stays put, you can get sandable primer (most rattle can primers often are) and lightly scuff the primer after it dries with your sand paper before you spray the actual paint to help the paint adhere even better to the pillar.
Also note, a lot of those ultra smooth, glossy interiors that you see on most SEMA show and magazine cover vehicles that have painted interiors usually have full body work done on each part that is painted. Sand and bondo (repeat as necessary), primer, sand, automotive exterior paint (usually multiple coats), then clear coat (usually multiple coats), and then wet sand and buff.
I hope that this info helps. Be sure to post pics when you are done.
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