OPI is a good professional brand. Sounds to me like there may be air getting in the nail polish. When you mix the bottle, don't shake it, roll it back and forth between your hands. This warms and mixes the polish to make it easier to apply and it will go on smoother. If you still have trouble, you might want to consider using a different brand. I'm not familiar with Attitude, so I can't say what kind of quality it is.
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--Vicki
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