BOTTOMLINE:Nine40e (Seller) and RocRide (Manufacturer) rock! Really!!Fantastic retailer and manufacturer with amazing customer service and a good product! “Very satisfied” is an understatement.Super happy!TIPS FOR POTENTIAL CUSTOMERS:There are two types of bicycle tire tubes:1. Butyl rubber2. LatexThis product is specifically for Butyl rubber tires. It uses vulcanizing cement to seal the puncture. It will NOT work for Latex tubes. For Latex tubes, use the “Glueless” patch kit product.I am not sure how to identify if a tube is of the rubber or latex kind. I leave that as an exercise for you! ?SUGGESTIONS FOR THE SELLER/MANUFACTURER:It would help to add information about the different types of tubes and the applicability of this item. I don’t think it is reasonable to expect customers to know this information.I am guessing that the negative reviews that have complained about the patch not working could likely have used it on a latex tire, like I did.MY EXPERIENCE:Bought this vulcanizing patch kit to fix punctured rear tube.Applied the patch as instructed.Patch didn’t hold and came off soon after inflating tire.Disappointed.Wondered what went wrong.Ordered a new tube and got the bicycle back on the road.Front tube punctured after couple of days.Applied patch as instructed, this time even more carefully.Patch didn’t hold and came off soon after inflating tire – again.Disappointed and annoyed. Curious to find out if the fault was in the product or in me.Contacted RocRide with a picture of unpatched patch.Received response in only a few minutes:- My tube needs a different type of patch – the glueless kind, not the vulcanizing kind- I will be getting a refund- I will be getting a glueless patch kit sample for freeDidn’t ask or expect a refund. They gave it.Didn’t expect a free sample. They sent it.Applied glueless patch as instructed.Worked perfectly.Super happy!Thank you Nine40e and RocRide!