Question

Will roof rejuvenation stop my roof from leaking?

No, and be careful with anyone who says it will.

A rejuvenation treatment is not a sealant and it is not designed to waterproof a roof. The overwhelming majority of roof leaks do not come from the middle of a shingle anyway. They come from flashing: chimneys, skylights, vent boots, valleys and the joints where the roof meets a wall.

If you have an active leak, what you need is a repair, and that is what we will quote. Treating the surface afterwards is a separate decision about the other twenty years of the roof's life.