The answer to this question is very simple. At the end of the application process the nails will always be sticky. In order to remove this all that needs to be done is a quick wipe down of the nails with a cotton ball wet with alcohol.
To see the exact steps for shellac nails click Step by Step Shellac Nails Tutorial.
If you have any other questions on why your shellac nails are sticky?, please leave a comment below.