How long must one wait to apply the finish coat for two-coat cement plaster after the first coat?

The correct answer is based on the standard curing time required for two-coat cement plaster systems. After the application of the first coat, it is essential to allow sufficient time for the plaster to cure adequately before applying the finish coat. This curing time is critical as it impacts the adhesion and overall performance of the plaster.

In general, waiting 48 hours before applying the finish coat ensures that the first coat has reached a sufficient level of strength and moisture loss is minimized. This helps prevent issues such as cracking or delamination of the plaster once the finish coat is applied. Curing conditions, including temperature and humidity, can also affect this timing, but the 48-hour guideline is widely accepted in the industry to promote optimal performance and durability of the plaster system.