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@BeaconJon
I had the same issue with Conti Sprinters on my chinese 88mm rims.
First application gave some really poor results but I put that down to my technique as I didn't "stretch" the tubs into the rim as I worked away from the valve.
Did this upon re-application, tubs sat better but still a little lumpy at the valve.
I then opened up the valve hole with a small round file and chamfered it out a little too.
Third re-application and they're pretty good although the construction of the Sprinters means they have an overlap of the base canvas which is impossible to get rid of.
I think I'll ride these for a bit and eventually get some higher end tubs.