In a YouTube comment on the video about the Laguna ceramic guides for the Italian LT-18, someone asked if the ceramic guides abrade the blade. The blade does show scuffs and scratches where the ceramic guides touch, but don't really dig in or anything. For example, the rear "thrust bearing" equivalent is a ceramic rod pressed up against the blade. You should rotate it more often than I do or you get a groove in it suggesting that though the ceramic is hard, the blade still wears the ceramic. I have a pronounced groove now, but you simply rotate it to a new flat spot.
With some of the goofy resawing I did for No Comment #2, my blade finally needed to be changed after 22 months. I'm not a pro so I don't use it daily, but I do use it a lot especially resawing wide stock so 22 months is a heck of a long time! Before shipping the blade for sharpening today, I took closeup photos of the blade to show the wear after 22 months (it was a new blade):
This is a 1.25" Resaw King and should get 5-6 resharpenings before it's dead. That's 6-7 "between sharpening" times you get to use it so the cost starts going down. When I got the Italian LT-18, I bought 2 Resaw King blades as they had a special for new bandsaw buyers so at least I can finish this project while the blade is out.
The crud in the kerfs is indeed MDF. Evil that stuff...