Originally Posted by rpenmanparker

Although this experiment does not involve quantitative results, I think it provides ample evidence that the rubber cement commonly supplied for patching bicycle tubes is just plain rubber cement. If you have a bunch of tubes to patch, I recommend purchasing both quality patches and plain rubber cement in bulk. The idea that tube patch "vulcanizing fluid" is a special formulation containing chemicals that activate the vulcanization appears to be false. It is still my belief these chemicals are actually in the patch.