Cost & Quoting

Paint and Resin Compounding Cost Per Unit: Building a Quote That Holds

Break down real cost drivers in compounding, from pigment loading to mixer time and scrap, and build a defensible cost per gallon or per kg.

In compounding, raw material is 60 to 78 percent of cost per unit, and pigment usually dominates that share. TiO2 at 3.10 to 4.20 dollars per kg loaded at 15 to 22 percent by weight can be 35 to 45 percent of a white base cost all by itself. Resin binder runs 1.40 to 3.80 dollars per kg depending on chemistry, and specialty additives and driers, though small in mass, can add 0.20 to 0.60 dollars per gallon. Start every quote from a bill of materials priced at delivered cost, not list, and let the Pigment Loading Cost calculator convert loading percent straight into dollars per unit.

Yield loss is a material cost you already paid for and cannot ship, so it must ride on the quote. At 4.25 percent yield loss on a base costing 2.90 dollars per kg of charged material, you eat about 0.123 dollars per kg of good output, which on a 1,080 kg per cubic meter product is roughly 0.50 dollars per gallon of pure lost material. Quotes that price only shipped mass and ignore cling, holdup, and purge understate cost by exactly that yield gap. The Resin Yield Loss calculator gives the percent; multiply it by charged material value to get the adder.

Direct labor in compounding is cheaper than most estimators assume, but changeover and QC labor are not. A two-operator cell at a fully burdened 42 dollars per hour costs 84 dollars per productive hour, but a color change adds 45 to 90 minutes of cleaning and staging that produces nothing. On a 4,000 kg batch that clears in 6 hours, a 75 minute changeover adds about 105 dollars, or 0.026 dollars per kg. Price changeover separately per run, because a 20 batch campaign of one color and 20 single-batch color changes carry wildly different labor per unit.

Mixer and vessel time is the constraint most quotes misprice. If a disperser costs 190 dollars per hour to own and run, and it sits at 66 percent utilization, your real cost per productive hour is 190 divided by 0.66, or about 288 dollars. Idle time does not disappear from the P&L; it loads onto every gallon you did ship. Use the Mixer Utilization calculator to find the true productive-hour rate before you spread machine cost, and quote small custom batches at that loaded rate, not the nameplate rate.

Color match rework and cleaning solvent are the two costs estimators forget most often. At an 18 percent first-pass fail rate adding 34 kg of correction material at 3.00 dollars per kg, expected rework material is about 18 dollars per batch, plus a re-sample and a re-blend. Cleaning solvent at 26 L per color change times 2.10 dollars per L plus disposal is roughly 70 to 90 dollars a change. The Color Match Rework and Cleaning Solvent Usage calculators turn both into per-unit adders so a short custom run does not quietly run at a loss.

Overhead, VOC documentation, and sampling are real recurring costs, not rounding. A regulated architectural or industrial coating batch can carry 20 to 45 minutes of VOC documentation and 15 to 30 minutes of lab sampling per batch. At a 55 dollar per hour lab rate, that is 30 to 70 dollars a batch that is pure fixed cost on a small run and negligible on a large one. The VOC Documentation Time and Batch Sample Workload calculators size this labor so you can decline or surcharge tiny regulated batches instead of subsidizing them.

Roll the drivers into a stacked cost per unit: delivered material, plus yield-loss adder, plus direct labor at true productive hours, plus changeover, plus loaded mixer time, plus rework and solvent, plus documentation and sampling, plus plant overhead as a percent of the above. A typical mid-volume industrial base lands near 11 to 16 dollars per gallon fully costed, and small custom color batches can run 30 to 60 percent higher per gallon on changeover and setup alone. The Formula Margin calculator sits on top to set your sell price against a target gross margin.

Estimates go wrong in three predictable places. First, pricing shipped mass instead of charged mass, which hides yield loss. Second, spreading machine and labor cost at scheduled rate instead of the utilization-loaded rate, which underprices small runs. Third, treating changeover, sampling, and VOC work as free because they are not on the BOM. Fix all three and quote each batch size on its own cost curve; a 200 kg trial batch and a 4,000 kg production batch of the same formula should never share a cost per gallon, and the Formula Margin calculator makes that split explicit.

Published 2026-07-01.