I used two coats of Nubar 'Hollywood Pink' and then a coat of Seche Vite 'dry fast top coat'. Once dry I applied one coat of OPI 'Black Shatter'.
The instructions for the 'Black Shatter' said to apply over completely dry nails which is why I applied a coat of the Seche Vite first and I only waited a few minutes before applying the crackle polish. It was late and I wanted to get finished. I wasn't sure if it would work as I didn't leave the base polish to dry longer but I am very happy with the finish.
I tried with different thickness of the 'Black Shatter' but it didn't make any difference to the finish.
This was the easiest crackle polish I have used and highly recommend it to lovers of the crackle finish.
I managed to get the full set of China Glaze 'Crackle Glaze' yesterday and so will be trying them soon.