Final answer:
A says RTV sealant dries by exposure to air and expelling moisture, which is not entirely correct. B's remark that anaerobic sealer dries in the absence of air is accurate. The choice of sealant should be based on the application's requirements.
Step-by-step explanation:
When deciding on which sealant to use, it is important to understand the properties and drying mechanisms of different sealants. A claims that RTV sealant dries in the presence of air by expelling moisture into the air. This is partially correct; RTV (Room Temperature Vulcanizing) sealants typically cure at room temperature and can form a skin by exposure to moisture in the air, but rather than expelling moisture, they tend to absorb moisture to cure.
On the other hand, B says that anaerobic sealer dries in the absence of air. This statement is accurate, as anaerobic sealers are designed to cure in the absence of air, especially when confined between metal parts.
Using sealants appropriately can have significant benefits in various applications like gardening, where the sealant can prevent evaporation, allow plants with sealed cuts to grow new branches, and protect plants from infections by pathogens entering through cuts. Hence, the correct thing to say is that RTV sealants cure with the presence of moisture, and anaerobic sealers require an absence of air to cure; the choice between the two depends on the specific application needs.