The coatings have very similar specs, but are formulated based on your spray equipment. Most Graco proportioners are high pressure, some commonly available used proportioners (like Vortex) are low pressure and use the low pressure polyurea. All depends on what equipment you are purchasing to do the job. The cartridge polyurea is formulated specifically to mix in the mixing tube as applied by the cartridge spray gun and not specifically considered “low or high” pressure. Of course… The cartridge products are much more expensive per gallon due to the cost of the cartridge, mixing tube, and labor (about $75 per gallon retail).