Review (2/5): there are better alternatives
Form a waterman That has been on long quest of finding the prefect sunscreen for demanding applications, Doc Martin falls short in several categories.
Did you know that the stuff will liquefy smooth skin neoprene on expensive O'neill wetsuits if left to sit and interact?
That leads to the next negative attribute, yes we don't want sunscreen that runs in your eyes when out in the elements, and Doc Martin certainly does not, but it will sting your eyelids (a often overlooked area that should also be protected from the sun)right after application.
What drives me away from the product though is its continuously sticky texture on the skin that blowing sand will attach to, looks like a beard sometimes after getting sandblasted on the beach, and then when you try to wash the stuff off, it will stay in your pores, makes your skin break out, because it is so hard to get off, even in a hot shower.
Bar soaps don't hardly cut it, as many "natural soaps don't either.
Try Avene from France, The have a 50SPF, is all natural, never stings, never runs and washes off easy. It is a little white but not to bad and really works super.[[ASIN:B002DLQ1QQ Avène Sun Care SPF 50+ Face Cream 50ml]]