Light, almost no smell (only top coat and foundation have moderate smell), we apply only organic texture to protect your health. The color will keep shine up to 30 days. Hotting colors optional, suitable for all occasions. 1. the base coat.Cure 30 seconds in LED Lamp, or 2 minutes in UV lamp. 2.Apply the first layer of color gel. 3.Cure 30 seconds in LED Lamp, or 2 minutes in UV lamp. 4.Apply the second layer of color gel. 5.Cure 30 seconds in LED Lamp, or 2 minutes in UV lamp. 6.Apply the top coat.Cure 30 seconds in LED Lamp, or 2 minutes in UV lamp. We truly believe we make some of the most innovative products in the world, and we want to make sure we back that up with a risk-free ironclad 45 day guarantee. If you don't have a positive experience for ANY reason, we will do WHATEVER it takes to make sure you are 100% satisfied with your purchase. Buying items online can be a daunting task, so we want you to realize that there is absolute ZERO risk in buying something and trying it out. If you don't like it, no hard feelings we'll make it right. We have 24/7/365 Ticket and Email Support. Please contact us if you need assistance. Remember: Shipping usually takes 2-3 weeks read our Shipping for more details!