metallic powder is useful when you want to give your model a realistic metallic sheen. Its A great way to improve the overall look of the model. its easy to apply,but tends to be quite messy.

materials:

> primer

> black paint

> metallic powder

> q tips 

prime your part

once primed, paint a layer gloss black. having this layer of paint is important when using this product  because it would affect the powder's "metallic" shine.

let the paint fully cure before proceeding to the next step.

I would be using the product made by "wave" but there are plenty of other brands that produce this as well.

Next, apply the powder using a qtip. Place a small amount and rub it on the part.

 Make sure you do a thorough sweep throughout the part. keep rubbing it in until the metallic powder starts to take effect, the longer you rub the better the shine.

the first layer you put would be quite dull, but the more metallic powder you add, the better the outcome.

the powder is not invulnerable to get wiped off. Its you're choice to apply a clear coat, but this will affect the metallic shine, so think twice.