Like I said before, the reason I run the liners only in the rear of the touring bike with the Marathon Greenguard is for one no tire is flat proof, and for two I don't want to be changing a flat on a bike with fully loaded panniers and fenders, it's a time consuming process to change the rear of a loaded bike, not to mention a huge headache, one that I want to try to avoid as much as possible.
Also in the case of the Kevlar liners those do NOT stiffen up the tire, in fact they actually cushion the ride a bit!
In regards to sealant, yes the initial dose of sealant is about what you said in weight, however that dose only works for about 3 months then you have to add more every 3 or so months adding to the weight.
When you tour you have to take some stuff with you, including a spare tire, a couple of spare tubes, and a spare liner if necessary. I determined, due to weight and space in my panniers, not to carry a spare liner, nor would I buy one if the tire got destroyed. This is what I would do if the rear tire got destroyed while touring. First I would remove both tires front and rear, move the front tire to the rear because the spare tire is not as robust, then I would put the spare on the front. I would go without a liner for the rest of the trip and not buy another one because of the hassle to do all of that, I would more than likely instead look for another more robust tire for the rear than the front one is. A lot of bike shops do not sell the Kevlar liner, but if I found a place that sold the tire then I would ask if they had a Kevlar liner, otherwise forget it. If I cannot find a shop that sells the Marathon then I would buy another lessor robust spare tire and hope I can finish the tour without anymore tire hassles.
The sealant thing, hmm, well the only one that I heard that's any good is the Stans stuff, it stops the leaks the best of any other brand in a test I saw. And quite frankly I'm still undecided that when I do take a major tour if I want to use a sealant or stay with the Kevlar liner. I prefer the idea of not getting a hole in the tube to begin with, so the Kevlar line does that. And I don't want to go crazy with using both either, though some people I've talked to that tour long distances say they use both on top of a robust tire like the Marathon. I'm still on a limb about doing that.
Also in the case of the Kevlar liners those do NOT stiffen up the tire, in fact they actually cushion the ride a bit!
In regards to sealant, yes the initial dose of sealant is about what you said in weight, however that dose only works for about 3 months then you have to add more every 3 or so months adding to the weight.
When you tour you have to take some stuff with you, including a spare tire, a couple of spare tubes, and a spare liner if necessary. I determined, due to weight and space in my panniers, not to carry a spare liner, nor would I buy one if the tire got destroyed. This is what I would do if the rear tire got destroyed while touring. First I would remove both tires front and rear, move the front tire to the rear because the spare tire is not as robust, then I would put the spare on the front. I would go without a liner for the rest of the trip and not buy another one because of the hassle to do all of that, I would more than likely instead look for another more robust tire for the rear than the front one is. A lot of bike shops do not sell the Kevlar liner, but if I found a place that sold the tire then I would ask if they had a Kevlar liner, otherwise forget it. If I cannot find a shop that sells the Marathon then I would buy another lessor robust spare tire and hope I can finish the tour without anymore tire hassles.
The sealant thing, hmm, well the only one that I heard that's any good is the Stans stuff, it stops the leaks the best of any other brand in a test I saw. And quite frankly I'm still undecided that when I do take a major tour if I want to use a sealant or stay with the Kevlar liner. I prefer the idea of not getting a hole in the tube to begin with, so the Kevlar line does that. And I don't want to go crazy with using both either, though some people I've talked to that tour long distances say they use both on top of a robust tire like the Marathon. I'm still on a limb about doing that.