Painting Polyurethane

[TRAINS1941]

I have the Western Scale Models Steam Engine it sits on a base of Concrete.  But the base is Polyurethane does anyone have any experience painting this material it needs to be a cement color then weathered with oil and grease.  Marc thought the master might be able to help with this!  Any ideas!
Actually anyone with ideas it would be helpful!!

Jerry

[finescalerr]

I had great success with a little experiment I tried on cast urethane some years ago. It should work with any kind of plastic:

Get some plain old white latex interior wall paint. The stuff I used was fairly thick, an advantage. I brushed a couple of coats (undiluted) onto some rockwork and let it dry for a couple of days. I had hoped to create a surface similar to that of plaster and that's what I got. I applied dilute color washes and they sort of soaked in and stained the surface. I compared the resulting model rockwork with some actual walls nearby and the overall impression was virtually perfect.

It was really easy and incredibly effective. -- Russ

[TRAINS1941]

Thanks Rich and Russ.  That's what this all about people helping people to get to where they're going.  Thanks for the replies.

Jerry

[Hector Bell]

Hi, Right on Russ and Rich, may I also suggest that if you can get it, self-etch primer is great. It ignores SUP's propensity to go "like water off a duck's back" and dries almost instantly. I bought a half litre and was still using it 3 years later.  It has a greeny yellow colour and takes all paints perfectly from cellulose (of blessed memory) to watercolours.
I reckon Russ's paint on top of self-etch would be bullet proof.  Hector