You will need:
2. Rub your plug all over with fine sand paper. This creates a rough surface which the varnish can adhere to.
3. Apply your first coat of nail varnish and wait to dry completely before re-coating.
4. The number of coats required will depend entirely on the nail varnish used. For this shiny varnish I used about three coats, for the blue varnish pictured above I only needed two coats as it was extremely matte whereas for the sparkly plug I must have used at least five layers for complete coverage.