Most artists find the using their airbrush without the needle cap gives them more control. Removing the needle cap is fine but should you hit your airbrush against something or drop it you could end up damaging the needle itself. So to take care of your airbrush make sure that when you are not using your airbrush that you replace the needle cap back onto it. Take the time to gain knowledge of all the parts of your airbrush will help you to learn how to properly work your airbrush and also how to take care of it. If your airbrush is internal mix then it will have a needle. The purpose of the needle is to control the paint flow. Any damage to your needle can cause very bad paint spray patterns. If you don't want to get outdoors to look at new scenery and you don't want to go to the library then you can just surf the web. The internet if full of inspiration for your airbrush art. Start looking at various images and keep surfing until you find the one that gets your creative juices flowing again. Remember though that this does not have to be anything bold. It can just be some simple flowers or ivy trim but the choice is yours. Clothing is open to airbrush art as a way to create unique one of a kind clothing and accessories. Airbrush art can just be wording that you have added to your shirts or other clothing or it can be creative pictures of things that interest you. This base coat will help protect the nail from the paint and help the paint to adhere to the nail better. Metal should be wet sanded to give a rough grainy effect. This rough grainy effect will help the paint to adhere to the metal. With metal actually being smooth the paint will have a hard time sticking to the smooth surface. Books for Beginners to Advanced on Airbrush Art When looking to learn on your own about airbrush art then reading is one area where you can gain a wealth of information to help you learn more. There a lot of great books out there that will help you from the beginner level of experience all the way through to the expert level.