|Oh no! Rusty surface upset Genestealers! You don't want Genestealers to be upset! Or do you?|
- Something already painted with rust colors;
- Table salt;
- An airbrush.
Step 1 - Just add water
Coat the object that will have rust showing through in rusty colors and proceed to make it wet (with water to be very precise). At this point you can decide to leave large areas dry, these areas will not have any chipping effect later on.
|Not pictured: the water I used to cover this storage tank.|
Grab table salt and throw it on the wet surface. As a future reference to myself I should consider covering the surroundings of the object as I'm still wiping salt remnants of the rest of this model right now.
|Don't use fancy salt, just plain boring table salt.|
Let the water dry. The salt you threw on will stick to the surface.
|Salt dried to the surface of my storage tank.|
Grab your airbrush and carefully paint the surface including the salt. Use about as low a PSI setting as you can manage to avoid blowing off the worst of the salt. As I type this, I suddenly realize a quick way I could have used to rid myself of the unwanted excess salt on the bottom. I used several coats and added a slightly lighter green to the top as the darker green dried (colors used in the pictures below Vallejo Model Air Cam Green and Vallejo Model Air Light Cam Green (or River Troll Skin Color as I like to call these two).
|Are we green?|
|I said: are we green?|
It's almost the same as step 3, but now you just wait for the paint to dry.
Step 6 - Wash the surface
When the paint is fully dry take a wet rag or sponge and carefully wipe the surface you painted. The water will activate the salt causing it to fall off taking bits of paint with it. In the end your model should look something like this.
|You've got to love the ease with which this effect is achieved.|