There are different types of machines. HVLP or Airbrush Compressors. If you use an Airbrush System you will need to be a little more careful with which solutions you use as some can be too thick. The suppliers will always tell you if you ask. Otherwise you can use any solution with any machine. A lot of girls will go for the least expensive trainig they can find and then buy theie equipment or buy equipment when on offer and then do their training. The best option though would be to train and buy equipment from the same company as they often do free training if you buy the starter kit which often includes enough solution for quite a few tans. Once you have finished the solution you will be more experienced and be able to make an informed decision about who to use as a supplier next. hth's