Final answer:
Polyether rubber should be allowed to polymerize before pouring the impression. It is generally recommended to wait at least 30 minutes for complete polymerization.
Step-by-step explanation:
Polyether rubber should be allowed to polymerize before pouring the impression. The complete polymerization of the rubber ensures that it solidifies and forms the desired shape and texture for the impression. The time required for polymerization may vary depending on the specific type of polyether rubber being used, but it is generally recommended to wait at least 30 minutes to ensure complete polymerization.