Drives are like Gears of a Bike

FACT: CAULKING GUN DRIVES ARE JUST LIKE THE GEARS OF A RACING BIKE:

When choosing among drive systems, it is important to remember that the force needed to dispense thin (low viscosity) materials is much less than that needed for thicker (higher viscosity) materials.  Long nozzles generate significant back pressure and require more force

Just like a bicycle climbing up a steep hill, when you need more power (force) you downshift to a lower gear (higher thrust) to divide your workload into smaller, more manageable segments. The opposite is true on a straightaway (lower viscosity).  You shift to a higher gear, so you don’t have to pedal as frequently. The same concept holds for dispensing tools.  When you match the power of the tool to the viscosity of the material you will be the most efficient and comfortable.