Are moisture cured and humidity can even promote their cure. In some applications, the use of silicone can eliminate the need for a primer.
Strengths: Silicones weather better than other coatings with almost no erosion and they don’t get hard or brittle. Silicone is also good in ponding water situations.
Weaknesses: Silicones hold dirt and rain acts as a cleaner; therefore, the material loses reflectivity over time. It is also hard to adhere to silicone, so when a roof needs re-coating, you must either remove the coating completely or re-coat with a compatible silicone. Resistance to tearing is a mechanical weakness and silicone coatings should be used with fabric as a common practice.