Regarding the bubbles problem of thermoplastic road marking paint

     Pores and blistering occur due to the air, moisture or un-dried undercoating in the pavement voids, which expand or vaporize under the high temperature of the coating. Blistering is caused by the expansion of gases pushing up the coating, while pores are formed when the expanding gases penetrate the coating and leave holes, which are common defects of the coating. The probability of micro pores and blistering increases on a wet road surface because the micro pores are filled with moisture or humidity. The high-temperature coating causes the remaining moisture in the micro pores to vaporize and expand, forming micro pores and bubbles. The undercoating contains certain low-boiling-point components that are difficult to dry. When the un-dried undercoating remaining in the pores meets the high-temperature coating, the volatile substances rapidly vaporize and expand, forming undercoating micro pores and bubbles. Pores and blistering not only affect the appearance of the markings but also reduce the area where the coating is actually combined with the road surface, thus seriously affecting the adhesion and service life of the coating. Therefore, it is necessary to select coating varieties with better fluidity. Ensure that the road surface is dry, and after rain, it should be fully exposed to sunlight before construction. Choose a drying-fast undercoating and strictly control the construction temperature, paying attention to the coordination with the environmental temperature.

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