The level of emissions from an open mold primarily depends on which factor?

The level of emissions from an open mold is primarily influenced by the area with resin or gel coat exposed to the air. When you have a larger exposed surface area, more volatile organic compounds (VOCs) can evaporate into the air during the curing and application processes of the resin or gel coat. This exposure allows for a greater release of emissions, as the resin cures and the solvents evaporate.

In contrast, factors like the temperature of the environment can affect the viscosity of the resin and the curing time, but they do not directly determine the volume of emissions in the same way that the exposed area does. The density of the material used is more related to the structural properties of the final product and does not directly correlate with the emissions during application. Similarly, the speed of application can impact the working time or finish quality, but it does not inherently change the amount of emissions produced. Therefore, the exposed surface area is the decisive factor in determining the level of emissions from an open mold.