Why Does Sealant Crack, and How Can You Prevent It?
Fine cracks, separation or tears appearing soon after you apply sealant can be frustrating. Cracks at wall junctions, around windows, in wet areas or on exterior walls rarely have a single cause. Product selection, surface condition, joint dimensions and application conditions all play a part. Checking the right factors helps you achieve a neater, more durable and more reliable result. Common causes include poor joint design, dirty or damp surfaces, stresses beyond the sealant’s movement capability, inadequate priming and incorrect application geometry.
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