6.5 Gallon Backpack Concrete Sprayer .5 GPM Gas Finishing Tool for Cement Sealant Curing StainNEVER PUMP. NEVER LOSE PRESSURE. 15,000 SQ FT IN 10 MINUTES 10X Faster than Manual Sprayers, cover larger areas faster while applying your ideal concrete sealant, cure, top cast, form release, and more! ADJUSTABLE PRESSURE With a powerful 1. 8HP engine, never pump again and maintain constant, adjustable pressure from 50 435 PSI for even spraying! HANDLES 30% SOLIDS CONTENT Capable of handling solutions up to 30% solids content, this sprayer is perfect