Technical Guide
Make Your Sprayer Last Longer
A seized pump is the most expensive repair you will face. Ten minutes of correct cleaning after every job prevents it. This is the procedure.
Pump Armor part numbers: 235716 (946ml — enough for one season) · 235717 (3.78L — workshop size). Store-bought antifreeze is NOT a substitute — it lacks the lubricating properties Pump Armor provides.
Cleaning procedure after every job
Restarting after storage
In spring, flush Pump Armor out with clean water before using paint. Run the machine on water until the liquid runs clear — typically 2–3 minutes. Pump Armor is water-soluble so it flushes out completely.
If the pump is stiff or seized after storage without Pump Armor: gently tap the pump housing with a rubber mallet. This often frees stuck inlet/outlet ball valves. If this doesn't work, contact a repair partner.
Winter storage (long term)
For winter storage or anything longer than 30 days, use Pump Armor after the full flush procedure above. Store indoors above freezing. In spring, flush the Pump Armor out with clean water before painting.
Pump seized despite winterising?
Ask Marc — describe the symptoms and he'll diagnose the issue and connect you with a repair partner near you.
Ask Marc now →