I have some experience with this kind of paint, not the same brand, but they also said you could make 3d effects. I had some clients to experiment on and they lost their paintings with this sort of paint within days. Because it is so thick it doesn't stick very well to the acrylic/gel nail. Wearing normal acrylic paint the paintings stayed on untill they were do for an infill.
So I suggest you use L&P for making 3d flowers, and use normal acrylic paint (like Folk Art) for your flat paintings. Good luck!