If you've got some moss handy I don't see why it would hurt to try a thin layer. Many people have had successful clutches without though but I've found that the moss covered clutch had less, if not no, mould on them. The uncovered clutch had a teeny bit on the sides. But like I said before, a good egg shouldn't mould easily.
The Herp Room
"The day I tried to live, I wallowed in the blood and mud with all the other pigs" - C. Cornell