Polyurethane caulking

Polyurethane sealants are a quick drying and moisture-cured sealant that is used in many industries including building, construction, and the automotive industry. It is generally used for sealing joints in walls and floors. It works well on concrete, and it also seals and bonds fiberglass panels.
Polyurethane sealant proves to be an excellent resistor of water and ultra-violet radiation. It offers a permanent elasticity in all weather conditions. Urethane sealants are more designed for porous materials such as concrete, slate, and terracotta. It is highly protective in heavy traffic areas and resistant to grease, oil, gasoline and food splashes.

Silicone caulking

Silicone sealants are based on silicone polymers and cure to form a tough flexible rubber suitable for both household and industrial applications. The three main types of silicone sealant are; acetoxy cure which are acetic acid curing recognised by their vinegar like smell, alcoxy cure and oxime cure both of which are neutral curing. Acetoxy cure are most commonly used for internal applications whereas the neutral curing silicones are used externally due to their superior adhesion and weatherproofing properties. In addition neutral curing silicones are used on surfaces sensitive to acetic acid.