u/Accomplished-Fig1260

Hi all!! I do my nails at home, and i’m using a model one base coat mixed with some color to use as a “sheer nude” type of polish to go under french tips or such, but it is SUCH a struggle. As shown in the picture, it separates or just does this really weird texture thing that ruins my sets recently. What can I do to stop this from happening? Should I just buy a new real sheer coat or is my prep wrong or what? I don’t know what to do it’s so annoying.