I have another weathering "how too" guide. This time, it's for the NHEF coal hopper RTR by On Track models. I have weathered one and posted it on my facebook page as I was asked by a few people to do another "how too" guide. So...lets get started!
Please Note: All photos are taken under a desk lamp so the pics may be off in colour. However, no PC screen is the same so I believe it will be good enough for this posting. I will add a better (outdoor) shot of the finished model on facebook as soon as I can.
The above photo shows the model with some other projects painted in Dullcoat and with the bogies removed for painting in plastic primer. Plastic primer is available from auto parts stores and contains "flex aid" and is also specifically formulated to adhere to plastic surfaces! It is about your best shot for painting Acetal polymers like Delrin bogies.
As you can see above, I have dusted the model with a light gray pigment and painted all the parts that are to look rusted, with brown paint.
Now I have added some brown pigments to the gray, and blended them by adding more gray or brown as I needed it. I also coated the brown painted parts with a rust pigment.
Now I gloss coat the model, and as you can see it has lost some of the weathering, but that's okay; we need a gloss surface for the decals. Note: If your not adding Graffiti you may skip this gloss coat step.
In this photo you can see the finished model. I reapplied dullcoat on the graffiti covered model, and repeated the pigment steps listed above. I also added some rust pigment to a thinned flat clear (50/50 mix) and painted all the steel parts again. I then painted the plastic primed bogies with flat white and weathered the same way I did the model, only this time using black and dark brown pigments.