Hi Saltfever
thank you for the reply.
I am very interested in the idea of a differential water gauge to check filter service. I remember along time ago a industrial water filter having a differential pressure gauge to show when the filter basket needed to be emptied. I will research this idea and will see if I can incorporate this into my spray booth system. I would be interested in your views on how you would fit this type of gauge to this type of setup.
i will also get the data sheet for the paint.
many thanks again.