Since I have been asked about weathering wheels and trucks and I have very little to do at work today I dug through my files and found this: How I weather wheels and trucks 1. Wash the trucks and wheels with mild dish detergent and water. 2. Paint the face of the wheel, back wheels, and axles with Polly Scale Rust. I use an old paint brush to set the wheels over so they don’t roll around the work bench. 3. Use the Tool on the trucks to clean out where the wheels go. 4. I use old paint brushes to hold the trucks. I slide paint brush through the screw hole of the truck. I then stick the paint brush with the skewered truck into a block of hard foam to hold them. I also use an opened box of BBs for this. 5. Paint the truck with Polly Scale Grimy Black. 6. When the grimy black has dried I dry brush Polly Scale Rust onto it. 7. Put the wheels into the truck. 8. Assemble the truck onto the car. 9. After the car is weathered seal with Dullcoat the truck and wheel face along with the rest of the car. One thing I have found is that depending on how well you seal the wheels and the amount of use you may need to periodically touch up the wheels. I do it when I do my annual inspection of my rolling stock. You can see samples on my website.