I just sealed up a tire on the golf cart at work. Those tires are not as thick as a car tire. Sombody got to it before me and and used a automotive style tire plug. Needless to say he made it way worse. Imagine the reamer.
I tried the only tube company could find locally. It was a bad match at best and I injured it. So I plopped the tire back on and rejuvenated the the old slime after gingerly wiping it out soft clumps. The old product had been in there for about 4 or five years. I then did the rest of the tires as well Just added to them. In a unpaved parking lot riddled with ''big'' stickers that tire gets about 30 miles a day on it.
That is almost two months now.
That was the last time those tires needed any more attention. They don't need any. Sure once a blue moon might need harden them up a smigin. Valve core a noon never a problem.
Nobody has yet to reair any of those tires..they're the way I left them.
This is the way it has always worked for me. I ride until the tire wears down and the tube starts showing up.. Check this out...
http://youtu.be/-8KXFW201nM Pretty simple.
Also I have yet to see a preslimed tube with enough product to do much in it. Its just buddered toast at the most. In addition to that a 2mm thick tube is by no means a heavy duty tube. Mines are at lt least 4mm thick or I won't use'm. I have yet to actually see a pre type tube from that company that was thick by my currant standards. If I run a smaller 26x2.0 tire.I will not go to a 1.75 tube.
I am guessing that the said slimed tube is a 1.75 ''smaller than 2.0. That could be just fine in a smaller 1.75 tire. Problem here a lot of folks don't figgure out IMHO is that when a tube has to stretch to fill the girth of a known bigger tire. That tube is a paper thin party ballon at that point IMO.
On my Mountain bike ''non motored'' I have Q tubes if I remember right and at the tread section it was 3mm thick. . Could prolly dig up a old spare in the box and get you a name? Those tubes were for 2.40 I think?
On my motored bike it has custom rims that let me retrofit motorcycle tubes that don't stretch at all. 4 mm thick! With out a doubt.
All this said I gotta agree with Aleman it would be simpler for you to just get a differant tube? Guess I don't understand why?