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"Nui Cracks" often happen at flashing points (chimneys, vents, skylights). If the flashing has lifted, gluing the shingle down doesn't help. You need to seal the step flashing intersection, not the shingle.
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The system solves these problems by using a cross-linked butyl core with an aluminum or polyester scrim. When you press it onto a crack, the butyl flows into microscopic pores, creating a hydraulic lock. The "Nui" technology refers to nano-particles that expand slightly when wet, actually tightening the seal during a rainstorm. "Nui Cracks" often happen at flashing points (chimneys,