Repeating this quest requires you to farm your own Viscous Spittle from Spitting Spiders. Also, different bridge repair locations can be used in order to complete this quest from the second attempt onwards.
It is possible to repair more than one bridge in the same run after the first completion. The amount of cruor obtained varies from 150 for a single bridge, or 850 for all four. It is not known if the number of bridges repaired affects fame or seal drops.