When is the best time during the day to spray tan your skin?

I was just wondering if there is a time when self tanner (spray) would apply better to skin and if the effectiveness of the results depend on when you spray tan. Should the skin have time to firm up after a shower, or should the tanner be applied to just showered skin?

Another quick question, is it advisable to spray tan legs when they have just been shaved or should the pores have time to close?