I've been using ct for 20yrs. I put down 200 gal of safer sealer the end of this season so haven't been able to see the longevity factor, yet. I thought it was very nice to work with n am sold on that part. I also think ots a very good idea to use safer everywhere. For me, it's about $ 900. More per tanker . I can live with that. Manufactures say it last 90% of what ct does. But everything else I read says it lasts 1 to 2 yrs. If we take snowplowing out of the mix, my ct lasts 5 to 6 yrs. ( on drives) That's long way from 90%. Wondering if anyone with experience would care to shed some lite on this subject. Any new info would b helpful. Thank u.