How to Inspect a Reglazing Contractor's Equipment Before Hiring

By Tub Reglazing Directory Editorial Team · Updated 2026-08-26

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How to Inspect a Reglazing Contractor’s Equipment Before Hiring

Most homeowners spend more time reading Yelp reviews than they do looking at what a refinisher actually shows up with. That’s backwards. A contractor’s equipment tells you whether the finished surface will last three years or ten, whether your household will be breathing isocyanate fumes for a week, and whether you’re dealing with someone who does this work properly or someone who learned it from a YouTube video and bought a spray can.

You don’t need to be a chemist to evaluate what you see. You need to know what the right gear looks like, what’s missing, and what a contractor who resists your questions is telling you by resisting them. The FTC is direct on this: contractors who won’t let you look at their equipment or won’t document the materials they’re using are showing you something about how they operate.

This article covers the spray systems, respirators, containment materials, ventilation, surface prep tools, and mixing equipment you should expect to see. It also names the things that should send you straight to the phone to find someone else.

The spray gun question: HVLP, airless, and why it matters more than price

The spray system a refinisher uses directly affects atomization quality, overspray, and how well the coating adheres at the correct film thickness. There are three common systems in the trade: conventional compressed-air guns, airless sprayers, and HVLP (high-volume, low-pressure) turbine systems.

The [Professional Refinishers in Brooklyn](../cities/brooklyn.html) Group endorses HVLP turbine systems as the preferred method for residential refinishing, and the reasoning is practical. A bathroom is a small, enclosed space. Airless sprayers atomize at much higher pressure, which generates finer aerosol particles that stay airborne longer and penetrate further into the respiratory tract. In a fixed industrial booth with engineered ventilation, airless is manageable. In a 50-square-foot bathroom, it amplifies both the inhalation risk and the overspray problem.

That doesn’t mean airless systems are inherently wrong for this work. Multi-Tech Products’ technical data sheets are explicit that using airless equipment on high-solid urethane coatings without correct tip size and pressure adjustment causes runs, excessive overspray, and solvent entrapment under the film. If a contractor is running an airless system, ask them what fluid tip and operating pressure they’re using for the specific product being applied. A professional will know the answer without looking it up.

The one thing that is wrong, always, is an aerosol can. Aerosol products can’t build the mil thickness a two-component coating system requires. They don’t cross-link the same way. They won’t bond with the same tenacity. A refinished surface applied at incorrect film thickness may also fail to meet ASTM F462 slip-resistance thresholds for wet bathing surfaces. If you see spray cans in the contractor’s kit, you’ve already learned what you needed to know.

The single most important piece of equipment: the respirator

Stop reading everything else for a moment. This section matters more than the rest combined.

Two-component urethane and epoxy refinishing coatings contain isocyanates. OSHA identifies isocyanates as the leading cause of work-related asthma in the coating trades. Spray application generates the highest possible airborne concentrations. And NIOSH Publication 2004-116 makes one thing very clear: once a person is sensitized to isocyanates, re-exposure to even trace concentrations can trigger severe asthmatic reactions. Sensitization is permanent. There’s no un-doing it.

The contractor who shows up with a standard dual-cartridge organic vapor half-mask is not adequately protected. OSHA 29 CFR 1910.134 requires supplied-air respirators (SARs) for spray application of isocyanate-containing coatings. Air-purifying respirators don’t control isocyanate aerosol and vapor at the concentrations generated during spraying. This isn’t a technicality; it’s the regulatory baseline.

A legitimate contractor will have a supplied-air respirator: a full facepiece connected to an external air supply, operated in pressure-demand mode. It looks substantially different from a cartridge mask. You’ll recognize it when you see it. NIOSH recommends this configuration specifically for all spray application of isocyanate materials.

Ask the contractor directly: “What respirator are you using, and why?” If they point to a cartridge half-mask and say it’s fine, or if they seem unfamiliar with why a supplied-air unit is required, you’re looking at a safety gap that also tells you something about their professional training overall.

One more thing: you and your household shouldn’t be in the home during active spraying. The contractor should tell you that without being asked. If they don’t, ask. EPA guidance on isocyanate off-gassing specifies that restricted re-entry periods are necessary after application, and that ventilation must exhaust to the exterior. A contractor who doesn’t address occupant re-entry timing isn’t running a professional operation.

Containment and masking: more than just painter’s tape

Good containment work takes time. That’s the tell. If the contractor is moving fast through masking, the job that follows will reflect it.

Napco’s application guidelines specify the use of solvent-rated painter’s tape (3M or equivalent) and plastic sheeting to protect surrounding surfaces from overspray. The tape matters because standard blue painter’s tape degrades on contact with the solvents in refinishing coatings, lifting at the edges and allowing bleed-through onto fixtures. The plastic sheeting should cover the floor, toilet, vanity, and any adjacent tile work not being refinished.

In a bathroom with a surround or tile walls being included in the refinish, the masking work expands accordingly. Watch for these specifics: Are edges pressed firmly along the tape line, or just laid down loosely? Is the plastic sheeted from ceiling to floor along walls not being refinished, or just draped over the toilet? Is hardware removed or just taped around?

These aren’t cosmetic concerns. Overspray inside a cabinet or onto a chrome faucet finish is a nuisance. Isocyanate overspray that migrates into a vent or adjacent room is a health exposure for whoever lives there.

Ventilation: exhaust out, not around

OSHA 29 CFR 1910.94 is written for fixed industrial spray booths, but its core principle applies directly to residential refinishing: solvent vapor concentrations in the spray zone must stay below 25 percent of the lower explosive limit. In a bathroom, the contractor has to replicate that through portable exhaust equipment, because the bathroom fan on the ceiling doesn’t come close to meeting the standard.

A professional setup includes a dedicated portable exhaust fan ducted to push air out of the house, not just through the bathroom. An open window with a box fan is marginal at best. The EPA is specific that ventilation must exhaust contaminated air to the exterior and not recirculate it indoors. Any system that’s only moving air around within the space is not adequate.

Ask where the exhaust goes. If the answer is “out the window” with no fan, ask how they’re making sure vapor isn’t accumulating in the spray zone. A contractor who understands ventilation will have a clear answer. One who doesn’t may shrug and tell you the bathroom fan is running.

If you’re in a state with its own OSHA plan (California, Washington, Michigan, and more than twenty others), your contractor should know whether state-level VOC or isocyanate regulations are stricter than the federal baseline. California’s Cal/OSHA requirements, for instance, can exceed federal OSHA standards on chemical exposure controls. It’s worth asking professional tub refinishers in your state whether they’re familiar with applicable state plan requirements.

Surface prep: what the tools say about the finish you’ll get

A two-component refinishing coating is only as good as what it bonds to. Surface preparation is where a large percentage of early failures originate, and the equipment a contractor brings tells you a lot about their process.

You should see a dual-action (DA) orbital sander with a range of abrasive pads. Napco’s application guidelines specify grit sequence for scuffing the existing surface to create mechanical anchor points. A contractor who skips orbital sanding and relies entirely on chemical etching is cutting a step that will show up as delamination within a year or two.

The etching step matters too. Acid etching solution, applied correctly and allowed to dwell for the manufacturer-specified time, creates a chemical anchor that mechanical abrasion alone can’t fully replicate on a glazed porcelain surface. A professional will have both, use both, and rinse thoroughly between them.

Watch for detail abrasives: small pads or Scotch-Brite equivalents for working around drains, overflow plates, and the seat of the tub where a DA sander can’t reach. Corners that aren’t properly scuffed are common delamination points. A contractor whose prep kit is just a sanding block and a bottle of acid is telling you what the finish will do in year one.

Mixing equipment: ratio pumps vs. Hand mixing

Hand-mixing of two-component coatings is a documented source of finish failure. It’s also surprisingly common among lower-tier contractors because it requires no additional equipment investment.

Ekopel 2K’s technical data sheet is direct: deviation from the manufacturer’s specified volumetric mix ratio causes incomplete cross-linking, reduced hardness, and adhesion failure. The coating looks fine going on. It fails in six months. Ratio pumps or calibrated volumetric mixing equipment are the professional standard precisely because they remove the human error that turns a 2:1 ratio into something the chemist who formulated the product wouldn’t recognize.

At minimum, a contractor who hand-mixes should be using calibrated volumetric cups and a timed mechanical mixing process, not a stick and a guess. Ask what their mixing process is. If the answer is vague, the ratio probably was too.

What to ask about equipment maintenance and calibration

A good spray gun that hasn’t been cleaned properly between jobs will contaminate the fresh coating. Dried material in the fluid tip causes uneven atomization, which means inconsistent mil thickness across the surface. That inconsistency is one pathway to failing ASTM F462 slip-resistance requirements on the finished surface.

Ask when the spray gun was last cleaned and whether they flush between jobs. Ask whether the turbine or compressor has been serviced. Ask how they verify operating pressure for the coating they’re applying. These aren’t trick questions. A professional refinisher who works with this equipment daily will answer them without irritation.

If a contractor says something like “the gun’s fine, I’ve been doing this for years” without engaging with the actual question, that’s information. Experience doesn’t maintain equipment. Maintenance maintains equipment.

The red flags, named plainly

We’ve covered them throughout, but here they are together.

Aerosol cans. Automatic disqualifier. No exceptions.

A cartridge half-mask instead of a supplied-air respirator. This is the most common safety failure in the industry and the one with the most serious long-term consequences. Walk away or insist on correction before the job starts.

No containment plastic on walls and floors. If the contractor hasn’t brought sheeting and solvent-rated tape, your fixtures and flooring are getting overspray. The job is also going to be messy in ways that matter for the coating itself.

No dedicated exterior exhaust fan. A bathroom ceiling fan doesn’t meet the intent of OSHA 29 CFR 1910.94 for this type of operation.

Hand-mixing with no ratio verification. The coating that fails in six months will look exactly like a properly mixed one on day one.

Resistance to equipment questions. The FTC puts this plainly: contractors who resist inspection of their equipment or refuse to document materials are showing you who they are. A professional refinisher hired through a reputable directory, like the contractors listed for New York on this site, should be willing to walk you through their setup before they start.

Before you sign anything

A thorough walk-through of a contractor’s equipment takes ten minutes and costs nothing. Ask to see the respirator and confirm it’s a supplied-air unit. Look at the spray system and ask what product it’s calibrated for today. Check that they’ve brought sheeting and solvent-rated tape. Ask about the exhaust setup.

Any legitimate professional will welcome these questions. The ones who don’t have already told you what you need to know.

What question you ask first is up to you. We’d start with the respirator.

Frequently Asked Questions

What type of respirator should a reglazing contractor use?

A supplied-air respirator (SAR), not a standard dual-cartridge half-mask. OSHA 29 CFR 1910.134 and NIOSH Publication 2004-116 are both explicit that air-purifying respirators don’t provide adequate protection during spray application of isocyanate-containing coatings. If the contractor shows up with just a cartridge mask, the job hasn’t started yet, but your conversation about safety should.

Is HVLP or airless spray better for bathtub refinishing?

HVLP turbine systems are generally preferred for residential refinishing. The Professional Refinishers Group endorses them specifically because lower atomizing pressure means less airborne mist in a confined bathroom. Airless systems aren’t wrong, but they require precise tip and pressure adjustment for high-solid urethane coatings. Multi-Tech Products’ TDS documentation spells out exactly what those settings need to be, and deviation causes runs, overspray, and solvent entrapment.

Can a contractor use aerosol cans for tub refinishing?

No. Aerosol products don’t achieve the film thickness, adhesion strength, or surface hardness of a properly spray-applied two-component coating. Any contractor using aerosol cans should be treated as an automatic disqualifier. This isn’t an opinion; it’s a matter of what professional-grade coatings like Ekopel 2K, Multi-Tech, and Napco products are engineered to require.

How should a reglazing contractor handle ventilation in a bathroom?

They should bring a dedicated exhaust fan that pushes air to the exterior of the home, not just a recirculating bathroom fan. EPA guidance on isocyanate off-gassing requires that contaminated air be exhausted outside, not recirculated. Under OSHA 29 CFR 1910.94, the intent is to keep solvent vapor concentrations below 25 percent of the lower explosive limit in the spray zone.

What surface prep tools should a professional refinisher have?

A dual-action (DA) orbital sander with appropriate grits for scuffing the existing surface, acid etching solution and a proper applicator for creating a chemical anchor, and abrasive pads for detail work around drains and hardware. Napco’s application guidelines specify grit sequence and etching dwell times. A contractor who skips mechanical abrasion and relies on chemical etching alone is cutting corners the topcoat will expose within a year.

What are the biggest red flags when a reglazing contractor arrives?

Aerosol cans instead of a spray gun, a standard cartridge respirator instead of a supplied-air unit, no containment plastic on floors and walls, and hand-mixing of two-component coatings with no ratio verification. Any one of these is a reason to pause the job and ask questions. Two or more together and you should send them home.

Find a tub reglazer near you

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