Tech Guard wrote:Weathering powders are basically chalk, so it doesn't really matter which set you get, or by who it is made by.
WOW!! This statement could NOT be farther from the truth. Pigments very greatly. First off "chalk" or pastels are held together by a binding agent, that is what gives them the general shape they have, if there is no binding agent all you have is pure pigment or powder. In the case of chalk the binding agent is usually a type of wax, most often carnuba wax. When you working on paper and large 1/35 or larger tanks and vehicles grinding up some chalk and using it as powder is passable, but not very good results. On the wargaming scale I would strongly advise against using chalks, the wax will do funky things with your paints and doesn't look right.
Now onto the pigments that most model builders use, these too have a binding agent in them, not nearly as concentrated as in the case of chalk, but it is still there and it will still mess with your finishes. These model pigments work great by taking a brush that has the bristles cut short and working or grinding the powders into the surface to create the desired effect. The wax that is in the powders works into your painted surface and in most cases the effect is great and does not rub off, however, the wax can still do funky stuff with paints and finishes, added a pigment fixative to the area usually makes the effect look blotchy.
Then there is the pure pigment range. These pigments are pure, nothing is added to them and they produce vibrant results and take a little more work to get the desired effect. In most cases you need to use a pigment fixative to secure the pigment to your painted surface, otherwise these will rub off. However once the fixative is added there are permanent. I would strongly recommend this type of pigment for the scale we work with. Secretweapon and Mig products both make a line a true pigment powders and mig sells the fixative solution, though I have used some other stuff with acceptable results.
Here is an example of using the secret weapon powders to do some weathering on this guy;
Good luck.
Ashton