Despite washing the machine with water, mineral spirit and whatever to clean.. When
the cleanup is complete this is the product that needs to sit or occupy the lines to prevent the minimal paint particles from causing the system to not function
as it should. Yes, this is a extra step or a step many people I've found don't use. It's ultimately, my desire is that the sprayer function perfectly every time I use it. Titan made this product for a reason and the reason isn't for extra expense, it's for the life of your machine.