I’d like to share my experience with the MTV-12-B MT prop on my Lancair 360. The prop has 696 hours. I bought my LNC2  almost 5 years ago from the original builder here in Arizona. Shortly after the purchase, I noticed some grease seepage around the seals at the base of the blades. The builder said MT had said this was normal and not unusual. Unfortunately, it got worse to the point it was getting on the canopy. The prop went to the prop shop here in Tucson (he’s certified by MT) and he sent it to Florida and I was down for 6 weeks. This was quite an expensive ordeal. The seepage has occurred each year I’ve owned the plane but the shop here has fixed it under “wa...