This is the strongest adhesive I have ever seen.  Although it takes a long time to dry and harden (up to 7 days) once it is dry I can't see it ever coming loose again.  We used this to fix the fold down steps on our camper and it seems to be able to withstand the weight of a person stepping on the stairs without any problem.  I guess time will tell how long it holds up to this type of use but for just normal hold I don't see it ever letting go!