Operate and clean a plaster/stucco pump-sprayer rig for machine-applied base or finish coats
domain: graco.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Mix material to the manufacturer-specified consistency for pump application, which is often wetter/thinner than hand-application mix
Prime the pump and hose line before starting the wall to avoid air pockets and inconsistent output at the nozzle
Maintain steady walking speed and standoff distance while spraying to keep coat thickness consistent across the panel
Flush the pump, hose, and gun thoroughly with water immediately after each use, and disassemble check valves/fittings on breaks longer than the product's open time
Inspect hoses and fittings for wear before each shift, since a burst line under pressure is a common jobsite injury and material-loss event
Known gotchas
Letting mixed material sit in the pump or hose past its working time can set up and clog the line, requiring a costly teardown to clear
Skipping a full end-of-day flush is the single most common cause of pump/hose failure on plaster crews using rented or shared equipment
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