Question: Can the PMF hard surface tool be used on walls without dripping down the wall, and will it work with 100 psi pressure? Thanks for your help.

Answer: I really think is going to depend on your pressure to vacuum ratio. At only 100 psi I think it is possible that very little water will hit the surface as it will all get sucked back into the tool while a customer that is using 500 to 1000 psi on a small shop vac vacuum would have lots of water drip out of the tool.