![[EAH INDUSTRIAL]](https://data3.answerbase.com/answerbase/14455/Images/answerbase.brands.header3 (1).png?638469925900000000)
Answer
Dec 08, 2025 - 11:45 AM
This is another very common question — and like spray tip size, the correct answer depends on several variables.
That said, here is a real-world example using a typical professional 2K urethane system so you have a baseline reference.
Example Yield (Typical 2K Urethane System) Assumptions for This Example:
-
Part A: 1 gallon (128 oz)
-
Part B (catalyst): 32 oz
-
Mix ratio: 4:1 (Part A to Part B)
-
Working mix:
-
12 oz Part A
-
3 oz Part B
-
-
Reducer: 10%
-
Used as a topcoat over a properly prepared surface
-
Total mixed (A + B):
160 oz -
With 10% reduction added:
~176 oz sprayable material
Typical Real-World Usage:
-
Average bathtub requires 14–16 oz of sprayable material, depending on:
-
Film build
-
Technique
-
Equipment
-
Surface condition
-
Approximately 11–12 bathtubs per gallon
(based on one topcoat application, no waste, and proper atomization)
Why This Number Is NOT Universal
The yield per gallon can change significantly depending on the variables below:
Product Variables-
Which coating is being used
-
Solids content (high-solids vs lower-solids)
-
Epoxy primer vs urethane topcoat
-
Low-VOC vs traditional solvent-based
-
Is this a white tub or a color change?
-
Are you spraying primer + topcoat or topcoat only?
-
Is the surface:
-
Properly etched and bonded?
-
Previously coated?
-
Heavily sanded or stripped?
-
-
Turbine HVLP size (2–3 stage vs 5–6 stage)
-
Tip size and air cap
-
Transfer efficiency
-
Overspray and waste control
-
Film thickness
-
Number of coats
-
Overlap and gun speed
-
Operator experience
The Big Takeaway
Anyone claiming a fixed number like “15 tubs per gallon” without asking questions is guessing.
A gallon doesn’t refinish tubs —
a system does.
If you want a more accurate yield estimate for your setup, the following questions need to be answered:
Quick Yield Questionnaire-
Product name and manufacturer
-
Primer used or topcoat only?
-
Color change or same color?
-
Mix ratio and reduction percentage
-
HVLP turbine brand and number of stages
-
Tip size being used
-
Average wet film thickness
Answer those, and yield can be predicted very accurately — before material is ever mixed.
Add New Comment