I've ordered a waterproofing spray from Halfords. Apparently it's suitable for canvas/nylon. Am I in danger or ruining my (v. expensive) Rukka gear? Alternative appears to be have it done by an outdoor/camping shop in Hemel which Motor Cycles and Moore recommended. At £40 a pop for that vs £6 for spray, wot to do? Or should I get it back to Rukka. Now 6 yrs old, no longer guaranteed, I assume. Any advice?