What do you use as a topcoat? I get regular pedicures especially in the summer and the polish lasts forever. I usually have to get a new pedicure because my nails have grown as opposed to the polish chipping. I don't have the same luck with my fingernails, which I do at home. I usually use OPI as my color but wondering if anyone knows of a great topcoat that will not chip a day after I paint.