That is a pretty major crack! I'm glad you can use it in the painting. You might want to switch brands, although I've used Apple Barrel and had no issues like that. And a good way to introduce yourself to professional paints is by getting only black and white. The craft paint and professional acrylic paint can be mixed no problem.
I used craft paint for years before finally switching over to artists' acrylics. I wrote about it here:
https://gscartwork.blogspot.com/2019/03/can-you-create-great-paintings-using.html
Edited to add that Liquitex Basics and Liquitex Professional are both used by and are suitable for professional artists. Both are lightfast and archival. The only difference is the pigment load. The opacity of the Basics is more similar to craft paint.