[RWebb]

I don't get the test. What were you testing for?

Are you saying that one product's carrier completely evaporated and the others were still liquid?

If so, there may be a thin film of UV protectant on your spoon. How do you know there is not?

IT seems that you have really measured only the evaporation rate of the different carriers in these different products.

And maybe not only that since position on the trunk rel. to the edge of the trunk and sun position might affect the results. You could alter the positions and see if you get the same result tho.