Painting soft plastic

[doctorwayne]

I forget what it was, but there was a paint made for really slippery things like loco handrails.

The paint used on radio controlled automobiles will work on the slippery plastic, but I've also found that pre-painting with Tamiya paint will allow paints such as Pollyscale or ModelMaster to adhere better, but those items should be handled as little as possible.
You can also buy a product that I have in my hand, although it's not clear what the actual name of it is. 
It was originally developed for painting things on your car which are made from engineering plastics of various types, such as the side-mirror housings, or the bumpers and plastic trim that's the same colour as the car itself.
The product is from Sherwin-Williams, and the label reads, from top-down...


       SPECIALTY

        UP07228  

Low VOC Adhesion Promoter


It's a spray can with a 15oz. capacity, and while it was bought several years ago, I've not had need to use it.

Here's a LINK to some info on it.

I don't recall the actual price, but do remember that it was not insignificant.  I got it at a nearby shop specialising in paint and protective finishes for automobiles.

Wayne