Sherwin-Williams Macropoxy 646 typically costs about $100-$180 per gallon in a two-component kit, with a five-gallon kit often priced around $500-$900 before tax and freight. The full cost depends on kit size, color, surface preparation, applied film thickness, labor, and whether the job needs primer or removal of an existing coating.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Macropoxy 646 coating | $100/gal | $140/gal | $180/gal | Two-part product; price and package size vary by distributor |
| Five-gallon kit | $500 | $700 | $900 | Before tax, freight, and any tint or special-order charges |
| Applied coating, labor included | $3/sq ft | $6/sq ft | $12/sq ft | Small or complex jobs can exceed this range |
| Materials for one coat | $0.50/sq ft | $1.00/sq ft | $2.00/sq ft | Approximate coating cost at practical coverage rates |
What Macropoxy 646 costs by kit size
For the coating alone, budget roughly $100-$180 per gallon, or $500-$900 for a five-gallon quantity. Actual selling prices depend on the local Sherwin-Williams industrial coatings branch or authorized distributor, packaging, color, and order size. Some sellers quote the two components together as a kit, while others list component or package details separately; buyers should confirm that the price includes both parts in the correct ratio.
A practical budget for a straightforward coating project is often $3-$12 per square foot installed. That range includes more than the paint: surface preparation and labor can cost as much as, or more than, the coating itself. A large, open concrete floor with sound existing material may be near the lower end. Corroded steel, difficult access, multiple coats, or small mobilizations can push the installed price higher.
Coverage is determined by the specified dry-film thickness, surface profile, application method, and losses. At a typical 5-10 mil dry-film thickness, plan roughly 100-200 square feet per gallon in practical conditions, rather than relying on theoretical coverage. Rough or porous substrates and spray application can reduce usable coverage. Assumptions: U.S. distributor pricing, standard colors, ordinary freight, and no unusual surface repair.
How coating, prep, and labor shape the quote
Most installed quotes divide into coating, surface preparation, application labor, and job-specific charges. The table gives broad budgeting ranges; contractors may combine line items or price a project as a single square-foot rate. Local wage levels, access, specification requirements, and job size affect each amount.
| Quote item | Low | Average | High | Typical pricing basis | What changes it |
|---|---|---|---|---|---|
| Macropoxy 646 | $0.50/sq ft | $1.00/sq ft | $2.00/sq ft | Coating used for one coat | Coverage, thickness, waste, kit price |
| Surface preparation | $0.75/sq ft | $2.50/sq ft | $6.00/sq ft | Grinding, blasting, or cleaning | Rust, old paint, contamination, profile |
| Application labor | $1.00/sq ft | $2.50/sq ft | $5.00/sq ft | Mixing and application | Coat count, access, crew time |
| Equipment and mobilization | $150 | $500 | $1,500 | Per project or work shift | Blasting gear, lifts, travel, containment |
| Removal and disposal | $0.50/sq ft | $2.00/sq ft | $5.00/sq ft | Per square foot of old coating | Coating type, debris volume, local rules |
Labor estimates can be checked with a simple calculation: . For example, 16-24 worker-hours at $50-$90 per hour equals about $800-$2,160 in direct labor, before equipment, contractor overhead, and profit. The hourly figure is a planning range, not a fixed national rate.
Why surface profile and film thickness change coverage
Surface condition and specified thickness are major cost drivers because they affect both preparation time and the amount of coating required. Macropoxy 646 is a high-build, two-component epoxy, but a product specification still determines the correct dry-film thickness and number of coats. A 5-mil coat generally uses less material than a 10-mil coat; doubling thickness can nearly double coating consumption before accounting for losses.
Steel that needs only cleaning and suitable profiling may require modest preparation. Heavy rust, loose mill scale, failed paint, oil, or chemical contamination can call for abrasive blasting or more intensive cleaning. Depending on the specification, blasting to a defined cleanliness level may add $2-$6 per square foot compared with basic preparation. A small steel railing can also cost more per square foot than a large tank because setup and masking are spread across less area.
For concrete, porosity and moisture condition matter. A 500-square-foot floor may consume more coating than a smooth steel surface of the same area, especially if the concrete is rough or previously unsealed. Confirm the required surface profile and moisture limits with the product data sheet and project specification; coating over unsuitable concrete can lead to adhesion failure and expensive removal.
Job size and access also affect unit pricing. A 100-square-foot repair may carry a minimum mobilization charge of $300-$1,000, while a 5,000-square-foot open area can distribute setup costs over more surface. Work above 12 feet, around piping, or inside confined spaces may need lifts, fall protection, ventilation, or specialized procedures, adding hundreds to several thousand dollars.
Three Macropoxy 646 project budgets by scope
These examples show how the same product price can produce very different installed totals. They are planning estimates for ordinary U.S. conditions, not bids. Taxes, unusual freight, containment, and engineering or inspection requirements are excluded unless noted.
| Project | Approximate scope | Coating allowance | Labor and prep | Estimated total |
|---|---|---|---|---|
| Steel handrails | 300 sq ft, one coat, accessible | $200-$450 | $1,000-$2,300 | $1,200-$2,750 |
| Concrete utility floor | 1,000 sq ft, grinding and one coat | $700-$1,400 | $2,000-$4,600 | $2,700-$6,000 |
| Industrial steel tank exterior | 2,500 sq ft, blast prep and two coats | $3,500-$7,000 | $10,000-$24,000 | $13,500-$31,000 |
The rail example has a relatively high labor cost per square foot because of edges, masking, and small-area setup. The tank example assumes substantial access and preparation work, and a coating specification that calls for two coats. A contractor may require additional coating or primer if the project specification calls for a particular system; Macropoxy 646 should not be assumed to replace every primer or finish coat.
When regional labor and freight push prices higher
Regional price differences usually show up most clearly in contractor labor, travel, and delivery rather than in a universal product list price. As a planning comparison, labor-intensive work in major coastal metros may run about 15%-35% above a lower-cost rural market. Smaller cities and suburbs often fall between those benchmarks, although local demand and contractor availability can reverse the pattern.
Freight can add roughly $50-$250 or more to a small order, depending on package weight, distance, and delivery method. Industrial coatings may have handling requirements, and a distributor may charge a minimum order or delivery fee. For a large project, freight is often a smaller share of the total; for one kit shipped to a remote location, it can noticeably raise the per-gallon cost.
Request quotes using the same product name, color, kit size, and quantity. Ask whether the quote is for a complete Part A and Part B kit, whether tinting is included, and whether freight and tax are separate. Regional comparison: the percentage premium is a budgeting allowance, not a guaranteed market rate.
How long application takes and what crews charge
Application labor depends on setup and cure scheduling as much as on square footage. A two-person crew may spend 4-8 hours on a small, accessible repair after preparation is complete. A 1,000-square-foot floor can require 1-3 workdays for cleaning, grinding, coating, and cleanup, with extra time if the substrate needs repair or the specification requires multiple coats.
Commercial coating labor commonly budgets at about $50-$90 per worker-hour, with higher rates possible for specialized industrial work, union crews, night shifts, or confined-space tasks. Contractors may instead quote $1-$5 per square foot for application labor, separate from preparation. Minimum call-out fees of $300-$1,000 are common planning allowances for small or remote jobs.
Macropoxy 646 is a fast-cure epoxy, but temperature, ventilation, mixing, pot life, and recoat windows still govern the work sequence. The crew must mix only what can be applied within the usable working time. A rushed schedule, cold substrate, or limited shutdown window can increase labor and mobilization costs even when the coating quantity is small.
Which add-ons appear beyond the five-gallon kit
Preparation, safety, and disposal often account for more budget uncertainty than the kit price. Removal of failed paint can add $0.50-$5 per square foot, depending on coating thickness, access, and disposal requirements. Rust repair or concrete patching may be billed separately, often at $75-$125 per labor hour plus materials for small repairs.
Other possible charges include masking and containment, ventilation equipment, lifts, moisture testing, and after-hours work. A lift rental can add about $200-$600 per day, while containment or dust-control measures may add several hundred dollars or more. These are not needed on every job, so a quote should identify which items are included and which are allowances.
Ask whether the contractor has included primer, stripe coating on edges and welds, a second coat, cleanup, and disposal. A low bid that omits these items may not match a complete coating specification. For compliance-sensitive facilities, confirm whether inspection, thickness readings, or written documentation are required and separately priced.
How to lower the installed price without weakening the coating
The most reliable savings come from reducing avoidable labor and ordering only the coating quantity the specification requires. Consolidating work into one mobilization can spread setup costs across more area. If several steel components need coating, scheduling them together may avoid repeated travel, equipment rental, and minimum charges.
Prepare the site before the crew arrives when the contractor allows it. Clearing stored items, arranging access, and identifying areas that must remain operational can reduce paid waiting time. Do not perform abrasive preparation or solvent cleaning without agreeing on the required method; inadequate prep can cause premature failure and make the total cost higher.
Compare at least three detailed bids on the same square footage, prep level, coat count, target film thickness, color, and warranty. Ask for both the total and the unit price, plus separate allowances for repairs, freight, and disposal. Buying more kits than needed can leave costly unused material; buying too little may create a color or batch mismatch, so base quantities on the specified coverage plus a reasonable waste allowance.
Finally, avoid adding a primer, topcoat, or decorative finish solely by assumption. Use the system required for the substrate, exposure, and project specification. Conversely, do not remove a required layer just to reduce the initial quote: a cheaper coating system can fail sooner and increase the five-year expense through repair, downtime, and recoating.