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Analysis on the component of waterproofing paint showed that epoxy primer is the most prone to ignite once blended with hardener, epoxy primer develops the most volatile elements and the lowest flashing point. Most of the paint material tends to have lower flashing point once blended with hardener. Experiments prove that welding sparks can lead to ignition easily and especially so with epoxy primer and epoxy top coat, and urethane primer. Fire transmission speed of these waterproofing materials is much higher than general combustibles. Highest risk of catching fire is right after painting, and as time passes, the flammability decreases. Therefore, there remains flammability even after the painting, thus there should be close monitoring of the site so that there is not welding sparks nearby shortly after painting. Emergency firefighting system should be mandatorily equipped in the site as well. Lastly, protection measures should be implemented publicly. Warning of low flashing points or describing the fire risk with welding sparks on the box of waterproofing material could be one small example.