Decided to give the motorhome a good old clean today including the roof to rid of the mildew that has formed.Im glad i did as was surprised at just how poor the masticing is.Its recently had its 1st habitation check and damp readings were all good.I do have my own damp meter and have checked my self and all seems ok.However there is so much mastic that needs redoing as some is peeling away probably due to the manufacturer nor cleaning the plastic before applying.As for the quality of the work it is piss poor and i intend redoing the whole lot when we get some more settled weather as i did on both sides and rear of the vehicle.I don't mind doing this but it really shouldn't be the case and after a year is really unacceptable.It seems to me that the sealant used could also be of the type used in bathrooms etc just by the nature of the way it peels off.I know some can't but I'm just glad its something i can do for myself and keep an eye on all the seals for the time i own the motorhome as i really don't think i would want to go down the road of damp repairs.These companies really do need to step up their quality control.