If you are still having problems with the design smudging when you apply a top coat you should try floating the top.
This is the best way I know how to describe how to float the top: Add a large drop of TC to the top of the nail. Then in the lightest of ways pull that top coat down over the nail, in no more than three strokes. Your aim is to disturb as little as possible the konad design by just skimming the top coat over it.
(I hope that makes sense) Here is a really good blog post that covers this:
All about Konad (basics) | Parokeets
There are videos and all :hug: