Piz buin 1 day long photostable sun filters and patented technology provide your skin with long lasting protection from the sun and from uvauvb rays helping to prevent sunburn and ageing caused by exposure to the sun allows gradual tanning to use apply liberally 20 minutes prior to sun exposure one application is sufficient for a days exposure in the sun piz buin recommend that 1 day 6 hours exposure always re apply if in any doubt or if you have sensitive skin or as you feel is ne