I chose a couple of plain plastic pieces. The white plastic bracket is from a small paint pot tester rack that I picked up from a scrap resources centre in Worceter for free. While the yellow/grey roller is a spare part from a label printer that had just been replaced and was going to be thrown away.
Both pieces have been cleaned up and in the case of the white moulding, I have added a couple of plastic tube brackets or hole extensions which were glued in place with superglue.
I have roughed up the plastic with some sanding sticks prior to applying paint.
I produced this colour chart to show the main colours used. They are;
1 - Charred Brown 72.045 Vallejo Game Color
2 - 50/50 mix Charred Brown/ Orange Fire
3 - Orange Fire 72.008 (Note - I usually use Hot Orange 72.009 but on this occasion I had run out)
4 - Rusty Patina a textured craft paint that I have been experimenting with. I find that the texturing is a little to much for smaller models, but can be used on my 1:27.7 scale structures.
5 - Rusty Patina mixed with Charred Brown
6 - Rusty Patina mixed with Orange Fire
Rusty Patina bought from a craft store in Evesham for £7.00
I have basecoated the pieces with a Charred Brown to which I have added a tiny drop of black. The black was used around the banding and to add some shadows.
The paint was applied in two thin coats to which I have added some very fine powder which will act as texturing for the rust surface.
The first highlight. I have mixed some Orange Fire to the Charred Brown and started to stipple on the rust colour. I use a really old and very damaged brush for this, think dead spider and you are getting close to what the bristles look like!
A second highlight using more Orange Fire and the same damaged brush to add more rust effect.
The test pieces have been varnished with Galleria water based, Matt Varnish to which I have added some black (Nuhl) wash, notice how the pieces are now looking matt, but also how the rust texturing has been highlighted with the wash.
I then used an oil based Light Rust Wash, a rust wash from Soilworks to further highlight the shadows around the banding and accentuate surface detail and texturing.
Finally, I have used a rust coloured weathering powder from Humbrol which was dusted on to the pieces with a fan shaped brush, a brush I keep just for adding weathering powders,
And there you have it - How I Paint Rust Effects on Plastic. I hope it is of use to others who paint models and terrain.