I learned a hard lesson when we went down to Surfside. I had David apply sunscreen to my back. Well, he thought it was sufficient to spray just one spray. And then one spray for each of my shoulders. I totally forgot to spray my front. I have learned that BullFrog sunblock does work. However, it only works where you apply it. Needless to say I have a very interesting sunburn.
PS: This sunblock also has bug spray with it and it works quite well.