Proper use of spray powder

Hi, can anyone tell me when to use spray powder for my single color offset machine to avoid setting off.
A friend told me to use spray powder in between colors, but according to my offset operator spray powders are used only on the last color of the print job.

Has anyone tried using spray powder in between color? How did it go, did it affect the color of the finished product?
Please help me! Im having setting off problem.

Thank you.

Good day sir!

In my opinion, as per my experience we usually use spray powder when we are running full color job. In between them is a MUST to prevent spoilage due to "HAWA". If you are just running a single color job and there are no images you may not be required to use spray powder. Hope it helps.

Thank you for your reply Masterinc.

On a full color job, should we use spray powder per color?

According to my pressman, when he used spray powder on the first color (it was unintentional, because he forgot to turn off the spray powder after the previous job) After running around 200 impressions he noticed the color lightened because the spray powder has accumulated on the blanket therefore he has to wipe them off.

If spraying powder in between color is a must, is there a better way to avoid the accumulation of powder on the blanket?

Thanks