You’ll stop hair-line cracks from spreading AND widening, with this effective sealer! Super thin formula flows all the way to the source of the crack, sealing it from the inside out. Fast drying, waterproof and permanent, it works instantly and the bond is almost invisible. Ideal for drywall, wood, brick, concrete, plastic, fibreglass and more. So, fill in hair-line cracks BEFORE they become large and costly! 118ml.