What it is:A nail color base coat.What it
does:Sephora by OPI Base Coat is an essential step for
the woman who wants a long-lasting manicure or pedicure.
It's a critical step, especially for women who wear
dark nail colors, to prevent staining of the natural
nail plate.What else you need to know:The green formula
does not contain DBP, toluene, or formaldehyde.
this totally makes a significant difference in chipping. I apply 1-2 coats before 1-2 coats of polish and they'll last a good week without chipping, specifically with the sephora by opi polish along with any generic top coat. I'd highly recommend it! it doesn't dry out or make my nails brittle either
It can, but it wont work as well to prevent chipping or make them quite as glossy shiny. The base coat is meant to bond and hold the nail polish you put on next to your nail, where as the top coat is meant to seal everything in and typically add a shiny gloss. It's better than nothing, but not quite the same
I can't say that I've tried that with this specific base, but in my experience with others, using a strengthener under any nail polish, even with a base/topcoat can prevent the polish from sticking well to you nails. My polish would peel off in perfect little sheets. I would recommend a supplement like biotin to strengthen your nails. Of course, check with your doctor first to be sure it's ok.
You can skimp and use the base coat for both, but I wouldn't. The base coat is formulated to bond to your natural nail and the top coat is meant to protect against chipping. Plus, they'll last you a VERY long time, so $18 for a year's worth of base & top coat (if you do your own nails once a week for the entire year) really isn't that much. You would spend more than that on one professional manicure, think about it that way.