I don’t know when they went opaque but I had a couple clear ones. They say that they can only be patched with their patches, but I had better luck with standard rubber patches. I’ve done the melt and pinch thing and it worked for a while then I got a new hole at the edge of the pinch. A decent trick to get you home, but not what I would consider a permanent fix.
I have switched back to running a standard 29" tube in a 36er for ease of patching and local availability, while keeping the weight savings.
Any one have a good suggestion for a regular inner tube for my 32 night rider. I haven’t ridden enough on my foss tube to have any problems other than having to pump it up every time I ride. I have read quite a few posts with people complaining about them.
I fixed a leaking tube once using black roofing sealant and a small piece of tube when I didn’t have a proper patch on hand. It seeped air for about a day then sealed up and has been holding for months now. It might be an option given that trying to get conventional glue to seal in a location like that will be difficult. The roofing sealant is nasty stuff that will stick to everything.