The G-100 Gel Coat Spray Gun attaches to an air compressor and uses a disposable paper cup. It is a siphon fed unit that is very easy to use. We recommend this unit if you have a large area to cover with the metal coatings. The G-100 spray gun comes packaged with a #6 nozzle; we add two smaller nozzles for use with the metal coatings and five extra cups.
The Harbor Freight Sprayer is a very inexpensive version of the G-100 Spray Gun. It works very well with the one nozzle that is provided.