The process is quite different to spray painters who just spray onto the surface with minimal preparation, the traditional 2pac application requires extensive surface preparation, prior to the application of three wet on wet coatings of high build primers.
Around half of these coatings are sanded away with differing grades of sand papers until we obtain a surface that is finely finished, before we start applying our topcoats. Again three wet on wet coats of topcoats are applied to obtain the high quality of finish and adhesion.
If a high gloss finish is called for, the finished product is cut and polished in a similar process to how your car is cut and polished.
None of this process can be replicated by merely spraying a set number of coats in your home. Nor can the dust or overspray be adequately contained.