don't know about x-1 but, Tandy has a new formula tanner's bond contact cement that i won't buy again!
i loved the old stuff but what they have not is not working out.
biggest problem is trying to use the stuff when the temp is under 50 degrees. with the old stuff it could set in my gluing area (no heat) when it's in the teens outside and never had an issue. the new stuff also smells lots more and take much longer for the smell to go away