Here are some examples of their products:

Rust spots and spills by mikearnold, on Flickr

Rust streaks and graffitti by mikearnold, on Flickr
The photos show sheets of rust scrapes/streaks with some sulphur and oil spills at top and rust spots and an example of the graffitti below.
Now I love weathering with dry brush acrylics and enamels and powders but this was eye opening. I have admired Pelle Soeborg’s work but could never really master the creation of rust spots and scrapes the way he did them. Weathering Solutions have the…...weathering solutions. I have road tested these new products on some cars - a rather tired Evans 54’ box car and a couple of ACF 2-bay hoppers for cement. The decals come with full instructions for successful application and optimum results. They have a satin gloss sheen finish to them so they will need to be varnished with Dullcote or similar after they have dried and hardened in place. You have to cut each item out separately - they come on a continuous carrier film so be careful as many items are interlocking for optimum print capacity. They like warm water for a soaking first and slide easily into place. You just need a good eye to know where to place them for best effect and some Microsol to help them bed down over detail such as seams and rivets.