If a sealant loses its initial adhesion and flexibility, it may crack and begin to pull away from the surface to which it has been applied.
- Using a low-quality sealant.
- Using the wrong type of sealant for a particular application.
- The underlying surface is not sufficiently dry.
Use a top-quality, water-based pure acrylic sealant, or a silicone acrylic sealant, if the substrate – the underlying material – will not be subjected to prolonged contact with water.
These types of sealant are flexible enough to adapt to minor fluctuations in the substrate, stretching as gaps widen slightly over time. They also adhere to a wide range of interior and exterior building materials, including wood, ceramic tile, concrete, plaster, bare aluminium, brick and plastic.
Silicone sealants should be used for glass, but should not be painted.