What is the most critical factor to control during spray gun application of fireproofing?

The most critical factor during the spray gun application of fireproofing is the thickness and uniformity of the applied layer. This is essential because proper fire protection relies heavily on the fireproofing application meeting specific thickness requirements. Insufficient thickness can lead to ineffective fire resistance, compromising structural integrity during a fire event. Uniform application is equally important, as inconsistencies can create weak points where the fireproofing might fail.

The curing time, while important for the hardening and performance of the material, typically follows the correct application and thickness guidelines. The color of the material is generally irrelevant to its performance as fireproofing; it may have aesthetic implications but does not influence the fire resistance capabilities. The ambient temperature can impact the application process and curing time, but it does not directly affect the critical need for a correctly applied thickness and uniformity, which are paramount for the effectiveness of fireproofing material.