4. Squeeze a small puddle of Burnt Sienna acrylic     paint onto a sheet of paper. Dip the edge of the  paintbrush into the paint & dab the brush onto the paper removing most of the paint - we will be painting using an almost dry brush       

5. With an almost dry brush, stipple a very, very light coat of colour all over the item to be rusted. Dab the brush up and down to build up    colour & texture A lot of black should still show through. If you add too much paint, tap the area with your fingertips - this will remove some of the colour and add some texture - remember that a rust effect is not just colour alone - texture is also  important.

Optional : If you want more texture, a   little fine sand can be added to the paint

6. When the first coat is dry, a second coat is added in exactly the same way as the first. Again, some black should still show through.

Concentrate on areas where moisture would normally collect - such as around screws, in indentations and around handles, moving parts etc - the paint should be layered on thicker in these areas.

7. While the paint dries, you can mix the colour for the third coat. You can use yellow oxide straight from the tube, or mix a little yellow paint into the burnt sienna - you want a nasty browny / mustardy colour .