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Tri-coats

Any color that has the word "Tri-coat" has three different coats of paint applied at the factory. The first is a basecoat of color. Next a second coat of transparent color, called the midcoat is applied and finally, a coat of clearcoat. The midcoat color is applied very thin and adds additional depth to the paint. In order to successfully match a tri-coat, you should practice on a scrap piece of metal or plastic.
Application
First apply the basecoat. This is the main color coat. Next, apply the midcoat. This color goes on very thinly and you must practice a bit to get it right. Finally, you apply the clearcoat to achieve the correct color.  
Make sure to get the primer sanded very smooth before applying the additional stages of paint. Also, make sure that the BaseCoat is applied for the correct look, smooth & uniform. Once the paint is applied, it becomes very difficult to fix the underlying surface. The primer should be wet sanded before applying the paint. Use#1000 grit sandpaper on the paint and then apply a final coat without sanding before applying the next color. Always let the color dry for at least one hour but not more than 24 hours before applying the next coat of color..
When you apply the basecoat and midcoat you follow the same directions given at "How to Paint" for each coat. The real trick is applying the midcoat over the basecoat to achieve the right color. It's like using a colored transparent piece of plastic (think Saran Wrap with colors) over the basecoat to change the color. Add too little, and the basecoat won't be changed enough; add too much, and you will change the basecoat too much and have to start over again. Make sure you PRACTICE  on a TEST PANEL, OFF THE Project  to see how it turns out and keep comparing your practice work to the vehicle color, before you attempt spraying the vehicle!   Midcoats are best sprayed, using very thin coats, Practice and you can do a satisfactory  job.
Note:
Applying midcoats is more difficult than a regular base-coat/clearcoat combination but with some practice you can achieve satisfactory results. Because these can be very tricky, you may want to consider having a professional apply this paint or leave the entire job to a collision shop. However, it is also a very expensive repair job in the shop so why not try it yourself first to see how it turns out!