Greetings, I am seeking yet more advice from the community. We are about to have a solar panel fitted to the roof of "The Beast". Yesterday I did my best impersonation of Lionel Richie, dancing on the ceiling to give the roof a wash. I had noticed that, although not particularly dirty, the roof had a gritty feel with thousands of what I could only describe as fly droppings on it. Anyway, I spent a good time up there giving it the once over and now comes my question. I have half a mind (no comments please) to treat the surface of the roof to a dose of "Greased lightening" or something similar but, I am aware that this product, widely advertised on TV, has Carnuba wax in it and, if the TV is to be believed, will cover the surface in an invisible layer of wax that will prevent 'things' sticking to it. (On the advert, they spray paint and and attack it with bitumen which comes off with a wipe). What would be the effect of a Greased Lighteninged roof when the installer uses Sikaflex. Would it adhere or am I best leaving well alone until the solar panel has been installed and then doing the roof. As always, all comments and suggestions gratefully received.