Help, I am having problems with application. I practised on my friend with a light pink shellac and holographic powder, beautiful no problems. But when I apply the darker colours and silver and gold powder, they look fine until I wipe with disperse and some of it comes off. I was told it sounds like I didn't seal with top coat properly. It would make sense, but how much pressure should I use, should the applicator squeak, or should I apply it lighter, I am going a bit mental, trying to get this right, as it's so beautiful once I apply it, but frustrating at the end.