Does that activation imply that the glue needs to match the patch?? E.g. in Japan, patches and glue are marketed separately. For bigger tears you may e.g. buy a sheet out which you cut out a patch. Any shop will likely be offering a can of glue that can last for years without drying up. Myself I mix Rema and some quality Japanese products, but have yet to run into any problems.
Well, there differences between glues and between patches, and the stuff from one maker is designed to work with their other products. But there isn't that much difference between them, and the chemistries are largely compatible. I don't worry about it excessively. At work, where I do most of my patching, I have an 8 fl oz (250 mls, roughly) jar of cement that came from an auto parts place, and which gets used with Rema and other patches with success.