I have had the problem of the sun reflecting directly off of the glass on to me, which was not only blinding me but also increasing the heat. I just took my damp waffle weave from washing and laid it over the glass. If you needed to, you could also put a damp WW over the next section of paint that you are going to work on, which would cool it down a bit by the time you get to it. [/B]
Just not tons of sun. For now, these products allow me to do a great job just about anywhere. I still am requiring the use of electricity from the customer though.