Most effective crack repair system

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Hi there all,


I am sure everyone on here most likely has there own spin on this and I am guessing everyone says not to guarantee any sort of crack repair (which I don't), but I am searchig for the most effective crack repair system around.  


With the weath of knowledge and experience on here, it would be great to get some idea as to what system is the:-


1. Longest lasting and best adhesion

2. Quickest system to install with the fastest turnaround

3. Strongest

4. Cost effective


Just to throw another spanner in the works, I am mainly talking about exterior.  

We have ried all sorts of things including running full depth cuts at intervals to take the pressure of the crack which we have a lot of success with but I am always on the lookout for improvement.