Step 1: What you need
a mehndi/henna cone or 3D out liner
a paint brush
glue-you need to use a glue which would turn transparent when it's dry
Step 2: Designing
Step 3: Sealing the design
apply the mixture on the henna with a paint brush.don't apply it in a up and down movement.just keep drops of mixture on henna,and it will absorb.apply it only on the henna.keep it on a piece of paper to avoid glue dripping on your work top.
when the first coat of glue dries,apply another glue coat over it.and let it dry for about 6 hours