So when you slather on sunscreen this weekend, how well will it work?

New research claims four out of five brand name sunscreens are ineffective.

In fact, the Environmental Working Group claims the top-selling brands are the poorest performers, with NONE of the market’s leading sunscreen products making the grade for effectiveness and protection against BOTH UVA and UVB radiation.

Industry giants Coppertone, Banana Boat and Neutrogena are all disputing the results.

Click here for the EWG’s “Shopper’s guide to Safer Sunscreens.”