If the pen cover is not tight enough to write normally, you can remove the pen head and add some alcohol. After diluting the ink, you can write. Oily marker pen is a pen used by modern young people for graffiti and marking, but its graffiti effect is not as good as acrylic paint. Generally, netizens will encounter the ink of oily pen painted on some appliances or clothing. If these appliances are not afraid of organic solvents, it is recommended to wipe them with alcohol (generally), Oily pen can play a certain role in rust prevention when it is painted on the place where rust is easy to occur. It is better to use paint for rust prevention!