The Crack jack is great for repair of long cracks. Designed to be positioned on the interior of the glass and be spaced between 75 - 125mm (3" to 5") apart along the crack with the nylon pressure point centred on the crack. Screwing the nylon point down to the glass further opens the crack slightly for better resin entry. Available in Single or 3-Packs.
 
CJ
CJ3