Actually, Gurit resins are "rebadged" and simply someone else's product with a new label. I can't remember who's, but I can find out.
Yes, you can mix and match resin/hardeners from different brands, either wholly or partly. By this I mean (with some understanding) you can use one companies resin, with another's hardener. Of course you'll have to do some leg work, maybe some testing, so you can use comparable systems, but it's possible. It's not something I recommend for those without a good bit of comprehension, about the chemistry involved. As a rule, if the mixing ratio is the same, you can probably use someone else's resin or hardener. It's important to note the cure type and any peculiarities between the two, but they usually will be comparable.
Generally there are two basic formulations commonly available "BIS A" and "BIS F" and a few hardener agents (curing groups) cycloaliphatic amines (quite common), polyamine, cycloaliphatic, aromatic, aliphatic. Some of these can react poorly with resin systems designed for other curing agents. A quick check of labels or MSDS sheets will confirm which type you're playing with.
Again, you need some understanding, but with some leg work and research, you can, mix and match. If it's cured epoxy you're talking about, the point is moot, for the most part.
