I made a cooling system for my 6×4 bandsaw, used soluble oil, but found that the blade did come off the free pully quite often, I was at the time using plain steel blades, and I think they lasted a little longer. If I refitted the system now, I would make a wiper to remove the cutting fluid before it gets to the pully. The car windscreen washer pump was ok for most work, but there were times when some good pressure would be better to get the chips out of a long cut. I use bi-metal blades now, so have not bothered with making things wet and messy. Ian S C