If need to resume the passivated layer, then use a capful to 15-20 with water.Dip for several minutes and then rinse with water.The aluminum can resume the original passivated layer by this way.

• 如须恢复铝材的表面钝化层，可以将本产品一份兑水十五至二十份浸泡数分钟清水过净即可恢复铝板的钝化层！