Key message: Routing a crack prior to crack sealing extends the amount of time before a crack opens back up and needs to be resealed.
Cracks that have been previously filled cannot be routed because the existing rubber product will foul or “gum up” the router blade, thus, not allowing for a clean, well defined, routed “canal”. In this instance, it is recommended to clean and fill cracks using the method known as Blo-n-go, which includes the use of a heat lance and compressed air to clean the existing crack before filling.
An asphalt surface that contains many cracks, also known as “alligator cracking”, is another candidate for the Blo-n-go method of crack filling versus route and seal because of the possibilities of causing more surface damage during the routing process because of the numerous cracks.
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