Spray Gun Repair & Rebuild
Full Rebuild Service for Spray Foam Guns Losing Pattern
A worn spray gun ruins good chemical before it ever hits the substrate. We tear down, reseal, and rebuild spray guns to spec — mail it in or have a technician handle it on-site along with the rest of your rig.
What’s Included
A Real Rebuild, Not a Wipe-Down
A gun that looks clean can still be worn where it counts. Every rebuild covers the full assembly, not just the parts you can see are dirty.
Full Teardown & Inspection
Every rebuild starts with a complete teardown — front housing, mix chamber, needle assembly, trigger linkage, and air cap all inspected for wear, not just the part that's obviously failing.
Seal & O-Ring Replacement
Worn seals and O-rings are the single most common source of a leaking or drifting spray gun. We replace the full seal set on every rebuild, not just the one that's visibly weeping, since neighboring seals are usually close behind it.
Mix Chamber Cleaning & Repair
A fouled or worn mix chamber is where off-ratio, poor atomization, and inconsistent pattern usually start. We clean, resurface, or replace the mix chamber and check impingement alignment before the gun goes back to work.
Trigger Mechanism Service
A trigger that's sticky, delayed, or inconsistent changes how much material hits the substrate before the gun is fully open or closed — we service the trigger linkage and needle timing so shot-off is clean every time.
Pattern & Spray-Quality Troubleshooting
Fan pattern, streaking, and spitting are diagnostic clues, not just cosmetic problems. We use pattern behavior to pinpoint whether the issue is the air cap, mix chamber, needle wear, or upstream pressure from the proportioner.
Test-Fire Verification
Every gun is test-fired under real pressure before it ships or goes back to you — checking pattern, trigger response, and leak-free operation, not just a visual once-over.
Who Needs This
Signs Your Gun Needs a Rebuild
None of this fixes itself with more cleaning solvent. If it sounds familiar, get the gun on a bench before it costs you a job.
- Your gun's fan pattern has gone streaky, lopsided, or narrowed down from what it used to lay down.
- The gun is leaking chemical at the front housing, trigger, or fittings.
- Trigger response feels sticky, delayed, or inconsistent shot to shot.
- You're seeing spitting, poor atomization, or off-ratio symptoms that trace back to the gun rather than the proportioner.
Two Ways to Get It Fixed
Ship-in rebuild — fastest for gun-only issues
SITE
On-site service alongside the rest of your rig
[24-48 HR]
Typical turnaround, gun in hand
3
Major brands serviced — Graco, PMC, Gusmer
A gun is one of the few rig components worth shipping — it’s small, doesn’t need on-site diagnostics, and a full bench rebuild is usually faster than waiting on a truck roll for a gun-only issue.
A worn gun wastes chemical on every shot.
CALL 844-967-5247Common Questions
Spray Gun Repair & Rebuild FAQ
Should I mail in my spray gun or have someone come to me?
Gun rebuilds are one of the easiest jobs to ship — a gun is small, doesn't need on-site diagnostics in most cases, and a full teardown and rebuild is genuinely faster on a bench than in the field. We offer a mail-in rebuild path for exactly that reason, alongside on-site service for contractors who'd rather have a technician look at the whole rig at once.
How long does a spray gun rebuild take?
A standard rebuild — full teardown, seals, mix chamber service, and test-fire — typically runs [24-48 Hour Turnaround] once we have the gun in hand. We'll flag anything that needs a longer lead time, like a mix chamber replacement on backorder, before we start.
What's the difference between cleaning a gun and rebuilding it?
Cleaning removes cured material and buildup but doesn't address worn seals, a scored mix chamber, or trigger linkage wear. A rebuild is a full teardown with new seals and O-rings, mix chamber service, and trigger mechanism inspection — the difference between a gun that sprays clean for a few days versus one that holds pattern and ratio consistently.
Can a bad spray gun cause off-ratio foam even if the proportioner is fine?
Yes. The proportioner can deliver a perfect A/B ratio right up to the hose end, and a worn mix chamber or misaligned impingement can still produce off-ratio, poorly mixed foam at the substrate. If your proportioner tests clean, the gun's mix chamber is one of the next places we check.
Do you rebuild guns for all major proportioner brands?
Yes — [Certified on Graco, PMC & Gusmer Equipment], including the spray guns paired with each brand's proportioning units. Tell us the make and model when you request service so we bring the right seal kits and mix chamber parts.
Get Your Spray Gun Back on Pattern
Call dispatch now or send us the gun details and we’ll get a rebuild moving.