A few drops of 502 in the toilet won't clog the sewer line, and since you saw the 502 congealed, it won't clog the sewer line. Under normal circumstances, 502 glue will lose its adhesive force as long as it meets water, basically it will not stick in the sewer pipe, and it will stick in the sewer pipe because it rarely will not block the sewer pipe.
No, 502 is a hygroscopic curing glue, it will nationalize after encountering water, and a few drops will not stick to anything, so don't worry about clogging.