What is the difference between penetrating epoxy primer and sealing epoxy primer? How to apply?

（1） Penetrating primer has strong penetration and can penetrate into the base material. Penetrating primer can increase adhesion and hardness for slightly powdery and sandy bases and delay service life.

（2）Sealing primer has good sealing properties and can seal pores and gaps to prevent moisture. Sealing primer can block the pores in the substrate and has an anti-alkali isolation effect. For normal bases, sealing primer can be used, and the price is also more affordable.