Henna will produce the best stains on hands and feet, wrists and ankles, while designs on upper arms, chest and back will last the shortest amount of time. Mehndi generally lasts 7 to 10 days.
Scrub skin with soap and warm water to exfoliate, remove any lotion or natural body oils.
If the skin has any sunscreen or lotions on it the henna won't soak in evenly.
You may want to practice drawing some simple shapes and patterns on a paper towel before you move to the skin.
The henna begins to stain immediately so if you make a mistake wipe it off right away.
If you are uncomfortable applying henna freehand, draw a design on your skin using a waterbased marker or pen then trace over it with henna.
This will help you to apply the henna more quickly and with fewer mistakes.
Slowly apply even lines of paste by gently squeezing the applicator bottle or mylar cone.
Rest the weight of your hand on your little finger to help maintain a steady line.
Your line of henna should be smooth and have a consistent width for the most attractive results.
The applicator tip should not touch the skin but should be held just above the skin so the line of paste lays down in a nice round line like a rope.
Wrap the left over henna paste tightly and keep in the freezer until you are ready to use it on another day.
Just pull it out of the freezer and let it defrost for an hour at room temperature, you are now ready for another application.
Source : http://www.ehow.com
Application of henna with bottle applicator
Application of henna with syringe applicator
