What must be avoided when selecting a caulk for exterior applications?

When selecting a caulk for exterior applications, it is crucial to avoid low elasticity. Caulk is often used to seal joints where different materials meet, which are subject to movement due to temperature changes, moisture, or settling. A caulk with low elasticity may crack or lose its seal when these movements occur, leading to potential water infiltration and damage to the structure.

In contrast, water-resistant quality is essential for exterior caulk, as it helps protect against moisture intrusion. Fast drying time can be beneficial for quick projects, but it shouldn’t come at the expense of quality and durability. Similarly, easy application is a desirable characteristic that affects usability without compromising the effectiveness of the material. Thus, while these characteristics enhance the performance and convenience of the caulk, low elasticity can result in failures over time, making it a critical aspect to avoid.