From the time sealants came into existence to now they are in a wide variety of chemical bases. Furthermore there are three most common Industrial Sealants which are:
All are single component sealants that cure when exposed to moisture. Curing rate depends on humidity, environmental and substrate temperature and thickness of sealant. However, they differ in their final physical properties achieved after full curing such as temperature resistance, Weatherability, Surface Preparation required and paintaibility etc. You must decide on the final property you want. Generally sealants are considered to be low in strength for primarily sealing application. PU Sealant 221 is a glazing sealant that not only seals but bonds with extremely high strength. It has a higher hardness rating than standard body sealants.
Alstone PU Sealant 221 is a one-component, multi-purpose polyurethane adhesive/sealant which bonds well with many varieties of coatings such as metal primers and paint coats (2-component systems), ceramic materials, and plastics. It can be used to make permanent elastic seals.
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