Complete Waxoyl Professional application kit includes everything you need to do the job. This the simplest Waxoyl starter kit. Comes with one HRS gun with both K-3 and K-4 wands necessary for applying Waxoyl 120-4 to cavities and the K2 wand for applying Hardwax to the underbody. The K2 wand combined with the HRS gun gives a fine spray which is ideal for detail work and small vehicles, but many find it is too slow for large vehicle application. Note: With one HRS gun, the product must be emptied between applying Waxoyl 120-4 and Hardwax. No cleaning necessary if you plan on using the gun within 12 months.