we recondition used combines for resale. in our neck of the woods, auger troughs can rust out in 3 years. stainless doesn't last any longer. we use UHMW plastic and put it in everywhere grain can lay. recently took on trade a combine we did in '92, and the plastic is still as good as new. this plastic is called "wear resistant plastic" to us ordinary folk and in the plastic trade just ask for UHMW. don't use the 1_2 weight stuff. Tom