Anyone know if there is any reason I shouldn't use the P20 sunscreen on my 2.7 yo and 10mo old? I used it when I was in Florida, applied just in the morning and on a beach all day in the gulf of mexico and a didn't even tan let alone burn. I'm fed up with the white creamy suncream that just makes a mess and wears off and would rather put P20 on them in the morning so they are protected all day.