Silicone sealant manufacturer note: slow curing of window and door sealant is often caused by low temperature/humidity, deep joints, formulation differences, or improper storage/expired product, so check the TDS for expected curing behavior.
Window and door sealants (often single-component) typically cure from the surface inward by reacting with moisture in the air.
Curing speed depends on temperature, humidity, joint depth, and product type (refer to the product TDS).
Common causes of slow curing include:
1) Low temperature or low humidity
2) Deep joints where internal cure is slower
3) Different sealant formulations with different curing characteristics
4) Improper storage conditions or using product beyond shelf life
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