No, in traditional installations the permeability of WetLok should help mitigate the changes of efflorescence due to capillary action within the joint material as the surface of the joints heat up water will readily evaporate from the surface. Efflorescence blooms are mitigated by the fact that the water will pass through joints more readily than through the pavers.  Excess water will not remain an issue unless other forces in which the moisture is entering the project are placed upon it. Examples: irrigation systems, ground water, runoff onto the project.