Ethical Zinc - field study

So we went to the beach with a large group of families and friends, most of whom has children.

My wife put Ethical Zinc sunscreen on me, herself, 2 young girls (one of the girls was from other family).

Everyone else had traditional sunscreen on.

After 4 hours or so (including time in the water), everyone else (including kids and adults) who spent a lot of time in the water were sunburnt.

Me, my wife, and the 2 girls were not.

End result: all of the other wives in the group is going to Coles to buy Ethical Zinc - it was an easy sell.