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I have tried mixing powders together without much luck. First, the two must be of the same formulation for it to work IE., epoxie & epoxie or TGIC & TGIC etc. Usually when you mix powder, each separate color powder will show up. This is why it is vital to clean your hose and equipment very well when applying black or white colors. Any remaining powder WILL show up as dirt specs in your finish. Remember that powder veins are two different types of powder that are mixed together and have a reaction once they see heat.
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I have mixed blue and red together. Painted an aluminum cribbage board with it. It looked awesome! The real trick I believe through my trial and lots of errors is the fluidization time of the 2 powders prior to spraying.
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Some powders will blend together nicely to make color variations, and others will just appear as separately colored splotches. It has a lot to do with the formulation chemistries. It can also depend slightly on other factors such as particle size and pigment variations.
When you have two incompatible chemistries (urethanes and acrylics are especially bad when mixed with epoxy or polyester-hybrids), you will most likely see craters and other surface defects. This is because certain powders flow out at different speeds, which is one reason the manufacturer recommends a specific cure time and temperature. If you put compatible powders into a bag and shake them up, the pigments just may be similar enough to produce a blended color. Microscopically you may still see them as tiny dots because that's just the way dry-blended powder coatings work. Or sometimes you want that mottled appearance... try blending about 10% of a sand-textured coating into a smooth coating and you should see the difference in the flow characteristics of the powders. Orange texture inside a clear is a really cool look |
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i mixed lite gray and super wet black and got a really cool salt and pepper look on a trany case the costumer was very happy with the look sorry i did'nt get pics but i think if you try it you'll be pleased (beware of not mixing good will leave light spots )
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