a pulsed waterjet the continuous waterjet can be pressurized to very high pressures to achieve the desired surface preparation effect the continuous waterjet can be generated using a standard waterjet apparatus having no ultrasonic transducer or by deactivating the ultrasonic transducer in an ultrasonic waterjet apparatus in another embodiment of this invention a pulsed airjet apparatus can be used to entrain a stream of coating particles as abrasives blasting particles into the fluid stream for prepping a surface fig4 is a schematic depiction of an airjet apparatus 200 for entraining coating particles for generating a coating particle entrained continuous or pulsed airjet or any other low temperature or high temperature fluidjet as depicted in this figure the airjet system 200 includes a compressor inlet 201 and a compressor 202 for pressurizing the apparatus the apparatus 200 includes a reservoir storage cylinder 203 for storing a volume of pressurized air and also includes a pressure regulator 204 an air valve 205 and an air pressure gage 206 the airjet apparatus 200 further includes a coating particle hopper 207 for holding a supply of coating particles 208 a metering valve 209 is provided for metering the outflow of particles into a feed line leading to a pulsed or continuous nozzle 210.