Haha thanks guys, i will try to give a short explanation.
First of all i paint the base with a matt finish, the color is not so important; i used grey.
In the next step i mix rust pigments with water until it it has the thickness of... yoghurt...
I completely cover the base with a thick layer of this mixture, because the base is painted with a matt finish the pigments will hold better on the `rough` surface.
After drying, the pigments are very vulnerable, and because of that i make a mixture of burnt sienna oil paint and white spirit (about 20/80%), and carefully apply this mixture on the pigment surface with a pointed brush.
Because of this, you will get nice dark and light rust color differences in the pigment, and after a day of drying the pigments are now much stronger for the next step.
Then i take the final color (again grey enamel in my case) and completely cover the area with a fine brush, i don`t brush the paint on but i `tap` it on to avoid damaging the pigments.
After 10 minutes when the paint is just dry i begin to peel the paint with a scalpel.
Because the enamel paint doesn`t stick very well on the pigments, this is very easy to do and because the grey enamel paint is still fresh it will start to peel and come up.
If you wait to long with this the paint is to hard and it doesn`t peel, so timing is important.
In fact this is the base method i discovered, it is not easy but after some practise the results can be very good.
p.s Pepper Mint, when will you come to my house to wash my dishes?, my kitchen is overloaded......
Karel