Ready-mix coating vs blending in house, compared

We sell ready-mix, so read this knowing that. The honest position is that in-house blending is cheaper per kilogram and worse per batch, and whether that trade is worth it depends entirely on how many different products you coat and how much variability you can absorb.

Criterion	Ready-mix	In-house blending
Cost per kg	Higher	Loweredge
Batch to batch variation	Fixed at our endedge	Enters at every weighing
Raw materials to qualify	Oneedge	Five to eight per formulation
Vendor audits to run	Oneedge	One per raw material
In-house development time	Noneedge	Weeks per formulation
Formulation control	Ours	Yoursedge
Reformulating on short notice	Depends on us	Depends on youedge
Shade matching	Done against your sampleedge	Your pigment work
Dust and weighing exposure	One materialedge	Every component
Where a failure is investigated	With the supplieredge	In your own QA
Suits	Many products, lean QA	Few products, strong formulation team

Our verdict

If you coat one or two products at very high volume and have a formulation team with spare capacity, blending in house will be cheaper and you should do it. If you coat many products, or your QA is already stretched, the per kilogram premium buys back more than it costs in qualification, investigation and variability.

Choose Ready-mix when

A wide product range, frequent shade changes, a lean QA function, or a history of batch to batch coating variation you have not been able to trace.

Choose In-house blending when

One or two very high volume products, an in-house formulation team, and the appetite to qualify and audit every component yourself.

How to decide

Work it out from your own product.

Count the products you coat, then count your QA capacity. A unit coating two products at very high volume with a formulation team that has time is genuinely better off blending, and we will say so rather than pretend otherwise. A unit coating thirty products, changing shades regularly, with a QA function already stretched across audits and documentation, is paying the apparent saving straight back in vendor qualification, incoming testing and failure investigation. The number that decides it is not the price per kilogram, it is how many hours a year your team spends on coating raw materials.

Where this goes wrong

01Comparing only the material costThe comparison has to include vendor qualification, incoming testing, weighing labour, blending time, and the investigations that follow a batch that came out wrong.
02Blending without controlling pigment particle sizeShade drift between batches is usually a pigment dispersion problem rather than a weighing problem, and it is the hardest one to find after the fact.
03Treating a ready-mix supplier as interchangeableTwo suppliers can meet the same specification and behave differently on your pan. Qualify on your own cores, not on the certificate.
04Moving to ready-mix and keeping the old process parametersA ready-mix grade is developed on a particular process window. Ask for it, and start there rather than at whatever the in-house blend used to need.

Questions about Ready-mix and In-house blending

Because a customer who should be blending in house and buys from us anyway becomes an unhappy customer within a year. We would rather lose that enquiry at the start than lose it after we have both spent time on it.

Per kilogram, yes, and we do not dispute that. Per batch, once qualification, testing and variability are counted, it depends entirely on how many products you run. The comparison table above is written to let you do that sum yourself.

You can, and some customers do once a product settles at high volume. What you cannot easily do is replicate our exact formulation, because that is what you are buying rather than the raw materials.

Shade matching against a retained sample is the part of this that is hardest to bring in house, because it needs a colour lab and a reference library rather than a blender. It is the most common single reason a unit that blends everything else still buys its coloured coats.

Grades either way

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Ready-mix coating vs blending in house

Work it out from your own product.

Questions about Ready-mix and In-house blending

You sell ready-mix, so why write this at all?

Is ready-mix more expensive?

Can we start with ready-mix and move in house later?

What if we need a shade we cannot match ourselves?

Grades either way