Usually, we realize this by comparing with a prior application using the same adhesive or another type of adhesive. The open working time depends mainly on the weather conditions and the substrate.

Small differentjafions in temperature may bring dramatic changes to open working times given by the adhesive manufacturers. Depending on the temperature, the humidity, the air and the atmospheric pressure, the adhesive may present variations regarding the “pull”, in relation to the previous use of the adhesive within the same or another space and time. The experience of the technician helps him understand the water quantity that should be addedto the mixture of the adhesive during its preparation in order to achieve a longest open application time.