Pawel, to create the rusty surface I did this :
- first a rust color as a base coat was added,
- I then applied a rust color oil wash,
- followed by dabbing rust pigments in the wet oil wash,
- I then sprayed on the body color under low air pressure to protect the pigments,
- the top layer was then picked away in places by a tooth pick, and by rubbing with a stiff brush.
John, your words were a fantastic support !
James, this is exactly what I've tried to achieve !
Thanks a lot guys !