Sell Tinted Paint by Base and Formula, Checked Against the Ship-To

The SKU is the base. The color is a formula. EPA's national architectural coatings rule defines a tint base as "a coating to which colorant is added in a paint store or at the site of application to produce a desired color." Your warehouse stocks the base. Sherwin-Williams lists one industrial urethane for contractors in Extra White, Deep Base and Ultradeep Base, each in 1 gallon and 5 gallon sizes. The door red the contractor asks for is not on that list. It is a formula: which colorants, and how much of each, dispensed into a base. Some data sheets cap the colorant a base will take. One Zinsser data sheet says "Maximum amount of tint should not exceed 2 ounces of universal colorant per gallon." So the formula and the base it goes into are chosen together.

The formula belongs to an account and a job. Say a painting contractor turns units at an apartment community every month, against the property manager's four standard colors. The formula that matters is the one mixed last time, including any adjustment after a field match. When that history lives only in one store's dispenser, or on a lid in the van, the reorder starts with a phone call. Some dealers differ again: they buy untinted base and tint on their own machines.

Ten gallons of one color have to look like one color. EPA's rule requires a date on the container of each architectural coating it covers: "The date the coating was manufactured, or a date code representing the date shall be indicated on the label, lid, or bottom of the container." Still, a Rust-Oleum data sheet for a Zinsser coating says "Multiple containers of tinted paint should be boxed (intermixed) to ensure color uniformity." So one order line becomes a question. Can these ten gallons come from one base batch, and if not, does the order say so?

Whether a gallon may ship depends on where it lands. EPA's rule sets national limits. It says it must not be read to stop "any State or political subdivision thereof" from "Adopting and enforcing any emissions standard or limitation applicable to a manufacturer or importer of architectural coatings." The California Air Resources Board says its Suggested Control Measure "serves as a model rule that can be adopted by districts throughout California." It reports that "22 of the 35 air districts have architectural coating rules," and that "adjacent districts may have different rules." In the Northeast and Mid-Atlantic, the Ozone Transport Commission wrote "a model rule that the States could use as a template in the process of adopting their own regulations." So the key for a product decision is the ship-to address, not the state field alone.

At the counter, the colorant is regulated too. CARB calls South Coast AQMD Rule 1113 "more stringent than the 2019 SCM." The rule applies to "any person who supplies, sells, markets, offers for sale, or manufactures any architectural coating that is intended to be field applied within the District." It measures a coating's VOC "excluding any colorant added to tint bases." Then it regulates the colorant on its own: "No person within the District shall, at the point of sale of any architectural coating subject to paragraph (c)(1), add to such coating any colorant that contains VOC in excess of the corresponding applicable VOC limit specified in the Table of Standards 2." The tinted gallon is assembled at your counter. Which colorant system filled it belongs on the order record.

Architectural and industrial coatings travel different paths. EPA defines an architectural coating as one "recommended for field application to stationary structures and their appurtenances," excluding coatings recommended "solely for shop applications." Industrial maintenance coatings sit inside that definition as "a high performance architectural coating," and Rule 1113 gives them separate colorant limits. Some protective coatings are sold as a Part A and a Part B. OSHA's hazard communication standard requires a safety data sheet "for each hazardous chemical," and has distributors provide it "with their initial shipment and with the first shipment after a safety data sheet is updated."

Base from the ERP, formula on the order line. Each product is a base in a sheen and a size. Uncap Connect keeps inventory, orders, customers and pricing in real-time, two-way sync with the ERP. In this build a color is not a new SKU. A color step is built during implementation. It resolves a named color or saved formula to the right base, writes the formula onto the order line and checks the base's colorant capacity. Tinting is billable work. Uncap Portal lets a Shopify store "sell services and rentals alongside standard ecommerce products," so tinting or a field match is a priced line next to the gallons.

A formula library per account and per job. In Uncap Portal, contractors and property managers get real multi-user accounts with roles and permissions. Each buyer sees their own assortment and pricing, with reorder lists a click away. Storing formulas under the company and each named job, with the date and store of the last mix, is built during implementation. The crew lead reorders "Building C corridors, eggshell" without reading a formula over the phone.

Gallons from one base batch. Where your ERP tracks base stock by batch, batch-level availability, so the storefront only promises a quantity a single batch can fill and the order records which batch it ships from, is built during implementation on inventory synced through Uncap Connect. When no single batch can fill the line, the order carries a boxing instruction or goes to a quote, by a rule you set in scoping.

Products shown by ship-to, from rules your compliance team owns. The storefront does not decide what may be sold anywhere. Your compliance team keeps the list of which products may ship to which states and air districts. A rule table keyed to the ship-to address is built during implementation. It hides or blocks restricted products for that address and records on the order which rule version applied. Job sites in two districts mean two assortments under one account. Each product's safety data sheet sits on its product page, and the order records which version shipped, also built during implementation.

Bids and protective systems through Uncap Quotes. A portfolio repaint bid or an industrial maintenance spec runs through Uncap Quotes, which handles configure, price, quote inside the Shopify admin. Negotiated prices, tiers and volume breaks apply automatically. Exceptions go to the right approver, quotes carry validity windows and a full revision history, and approved quotes turn straight into Shopify orders. Kit pairing, so a Part A never ships without its Part B, is built during implementation.

On whether Shopify can carry paint logic. Uncap's published products do not include a tint formula library, batch matching for tinted gallons or a VOC rule table for paint. On Shopify, those rules are built during implementation from your data, so the questions are where they run and whether account data reaches them intact. Shopify's own help center warns that some App Store integrations aren't fully compatible with B2B companies and catalogs, so company, pricing and customer data might not map correctly through them. Uncap Connect is embedded inside Shopify rather than running as separate middleware. It syncs "customer-specific pricing, credit terms, and tax rules," and the ERP stays the system of record.

Base, sheen and size as the product. The catalog sells what the warehouse stocks, and a color step built during implementation keeps colors from becoming new SKUs.

Formula on the order line. Named colors and saved formulas resolve to the right base, built during implementation.

Formula library by account and job. Formulas a contractor or property manager has bought, stored under the company and the job, built during implementation.

Tinting as a priced line. Tinting, field matches and custom blends sold as services through Uncap Portal.

Gallons from one batch. Quantities promised only where one base batch can fill them, or a boxing instruction when none can, built during implementation.

Ship-to product rules. Products hidden or blocked by state and air district from your compliance team's list, with the rule version kept on the order, built during implementation.

Safety data sheets on product and order. Each product's SDS on its page, and the shipped version recorded with the order, built during implementation.

Quotes for bids and protective systems. Repaints and industrial maintenance specs quoted with account pricing, approvals and one-click conversion.

ERP sync. Pricing, inventory, customers and orders kept current, through an owned Uncap Connect app embedded in Shopify, or a managed iPaaS integration.

The line between product and build, in writing. Account pricing, reorder lists, services as line items, quote approvals and order conversion ship in Uncap Portal and Uncap Quotes. The formula library, batch allocation, ship-to rules, SDS records and kit pairing are built during implementation. The scope shows which is which before the build starts.

Built on the records you already keep. Your dispensers often hold the formulas, your ERP may hold base batches, and your compliance team keeps its own do-not-ship list. The build reads those records instead of asking the counter to keep a second copy.

Credentials you can check. Uncap is a Shopify Platinum Partner, on Shopify since 2013, with 380+ unified storefronts launched on Shopify.

Scoped before it is built. The Uncap Blueprint is a fixed-price, four-week plan, credited 1:1 toward implementation. It covers solution architecture, data taxonomy, an ERP integration audit, UX and flow prototyping and total cost of ownership, and ends with a risk register and a fixed-cost implementation estimate. For a paint business, that architecture work can cover your bases, formulas, batches and ship-to rules. You walk with everything you need to brief any agency or your in-house team.

This page sits under building materials ecommerce, which covers coverage and rounding to sellable units, job quotes, contractor pricing and submittals. This page goes one level down, into the tinted gallon: base, formula, batch and ship-to rules. If your counters also serve general contractors with job accounts and will call, see construction supply ecommerce. For the same ship-to pattern in another regulated category, see the field notes on compliance-aware ecommerce for crop protection and chemicals. For the ERP side, see the Epicor Eagle integration or the full list of ERP integrations.

Bring two documents: a month of tint tickets from your busiest counter, and the list of products your compliance team will not ship into certain states or districts. Together they hold the formulas, bases and ship-to rules this build has to carry.

Book a strategy session with Uncap, or start with a Blueprint if you first need the formula, batch and ship-to logic written down and costed.