- Inconsistent application: Perhaps this is because it's been only a day and they are not continuously exposed to the conditions to keep rusting.
- Inconsistent coloring: The foreground piece is mostly black or grey, while the two pieces in the back are very, very orange.
- Too orange: The hobby industry says paint your track "rail brown", not "rail orange"...
- Fragile: Too much handling and the rust comes right off. It could make a nice weathering powder though... To be fair, the same would and does happen to real rails; that's why the top surface is shiny after use.