I've used Ultraseal after winning it in a Caravan Magazine 'Give away' . It hasn't affected the running in the least. So far (touch wood) I have not had a puncture so cannot speak on that side other than having seen the firms demo's at the Caravan Club National Show - I was impressed then.
Same comments as Don. I did have the tube of a pneumatic jockey wheel (which had been treated) burst but this was due to sitting in the hot sun loaded - I forgot to ease the tension after pitching - too many folk offering me welcoming G&Ts.
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