There are a number of ways to wax your knitting needles but remember not to get them too slick so that your stitches slide off at the drop of a hat. That's why I won't use aluminum straights, even the short ones. My stitches are forever everywhere but on the needles.
The inexpensive sets of various sizes of Stainless Steel DPN's from China are hollow and nice to work with. I have one American set of size 4 DPN's and they are solid, heavy and fall out of my work when I try to use them.