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Your compressor - it's not a matter of precision, it's a matter of capacity. You NEVER need a smaller compressor to drive a paint gun, the compressor can never have too much capacity, since pressure at the gun is regulated at the gun. You can have too little capacity, though.
Your gun will have the air flow specs with it, and your paint will also give you some basic specs, too. You need to check your compressor to see if it meets those specs. If the compressor capacity is too small and can't provide the proper flow and PSI at the gun, you won't get proper atomization. Don't fall into that trap - make sure your compressor has enough capacity. If it doesn't, the gun will still spray, but you will not have a good time and it won't turn out good.
The gun you are buying is a good one. I predict you'll really like painting your own m/c panels. With the right equipment, it's a lot easier than you think, and it's very satisfying getting pro results. Have fun!
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