[Crex]

Never thought about that Ray. Not used many "structured" belts. I have a box of tri-zaks, but have only used one so far. I just don't do enough coarse/bulk type grinding to get them used up. I forge close enough to finish that they just aren't needed much....so haven't noticed that issue.

By what GK said about the shiny spots on his belts sounds like going to fine to soon and to fast, burnishing steel with clogged areas on the belts. If he doesn't have a belt cleaner in hand he can do almost as good with an old rubber soled sneaker. They just don't work to well on belts moving at high speeds (at least for me). I reserve the cleaner brick for my dedicated slower moving "wood" belts - very useful with them.