I can only comment on their cyclocross tubs, but Dugast use cotton casings and don't use any kind of sealant on them so in time they will rot, no matter how well you look after them. FMB also use cotton casings but use a waterproof sealant, so they are more robust. FMB's problem is their availability, you have to go direct if you want to buy some in the UK.
That said, the Dugast Rhino remains the premier choice for muddy races (not that we've had anything resembling mud in any London X League races so far this season).
I can only comment on their cyclocross tubs, but Dugast use cotton casings and don't use any kind of sealant on them so in time they will rot, no matter how well you look after them. FMB also use cotton casings but use a waterproof sealant, so they are more robust. FMB's problem is their availability, you have to go direct if you want to buy some in the UK.
That said, the Dugast Rhino remains the premier choice for muddy races (not that we've had anything resembling mud in any London X League races so far this season).