2445 has good recoating and flow-promoting effects, it can help paint or ink to wet the surface of various substrates, even substrates with very low surface energy, so, it can prevent surface defects such as shrinkage holes or edges shrinkage, and, the flowability, leveling and adhesion of the paint film can be also improved. It has high efficiency, good compatibility and good wettability, and even can improve the wettability of contaminated substrate. Its addition amount is small. It is effective even the addition amount is extremely low.