Just thought I would say, for anyone looking for a proper long lasting minimum 12 months glass sealant, you can get the full kit of the Nanolex premium glass sealant, there glass polish and glass cleaner as 3 items for £32.97!!!
That is a brilliant price as I haven't been able to source it on any of the other bigger sites (UF, Polished Bliss etc.) for less than £45, the closest I have found is the ultra glass sealant kit at £46, that one seals your glass for 18 months.
Just purchased this as my glass sealer for my decontamination in July, will last me a full year until I next do it, brilliant!