Contrast handles the opening pass of a paintjob efficiently. Glazing handles the closing — the correction, refinement, and unification work that Contrast has no answer for. They are not competing approaches to the same job. The medium chemistry matters too: glaze medium and Contrast medium behave in opposite ways, and using the wrong one degrades both techniques.

When GW discontinued their Glaze range alongside the Contrast launch, a lot of painters read it as a verdict: technique superseded, move on. The forum version adds wet blending to the argument — that wet blending produces better colour transitions anyway, and Contrast handles the rest, so glazing has no remaining job. Neither version holds up.

What Contrast actually replaced was the initial shaded base-colour pass over a light or zenithal primer. Before Contrast, painters who wanted a translucent shaded base would apply thin glaze passes over a zenithal highlight, building colour and shade simultaneously. Contrast does that job faster and more consistently for most purposes, which is why GW made the product rationalisation they did. For batch painting armies, it is the right tool.

What glazing does that Contrast has no answer for:

Colour correction on finished work

You have basecoated, shaded, and highlighted a model, and the colour has drifted — the red reads orange, the shadow came out too cold, a transition is too harsh. A glaze adjusts without overpainting. Contrast cannot do this on a dry, multi-colour model. Wet blending cannot work on a dry surface.

Unifying colour temperature

Competition painters almost universally apply a thin unifying glaze — a warm or cool tint — at a late stage to make the light source read consistently and pull together sections painted in different sessions. There is no product shortcut for this.

Smooth gradients without wet blending skill

Multiple thin passes over dry paint, each assessed before the next, can produce transitions comparable to wet blending with a much wider correction window. Scott (Miniac), one of the more respected painting educators online, routinely does a rough wet blend and then follows up with glazes to smooth the result — both in sequence, not one instead of the other.

Skin tones and organic surfaces

Human skin is translucent in real life. Multiple thin glazes of slightly different warm flesh tones, layered over each other, produce depth that single-coat approaches cannot replicate. If your faces look flat or plastic under a lamp, glazing is almost certainly part of the missing step.

A concrete exercise: paint a face your usual way. Let it dry fully. Apply a single pass of a very thin warm flesh glaze across the entire surface. Let it dry and compare. That one pass will smooth transitions, add warmth, and unify the face in a way that is hard to describe before you have seen it. Once you have, the argument about glazing being obsolete stops being interesting.

Glazing is a technique, not a product category

You can glaze with water-thinned paint, with inks, or with Contrast paint applied over dry painted areas where you want tinting rather than pooling. What makes something a glaze is translucency and intent, not which medium you used to get there.

Why dedicated medium exists

Water-thinned paint is harder to control. At higher dilutions, water alone tends to cause paint to bead on the surface, dry too fast at the brush edges, and leave tide marks — the ring where water evaporates faster than pigment. At very high dilution, water alone can weaken the acrylic binder enough to reduce durability and adhesion. Glaze medium addresses all of this: it slows drying so the glaze settles evenly and maintains the binder so the layer bonds properly.

Not all mediums behave the same

Lahmian Medium has low viscosity and dries faster — better for applying multiple passes in a single session without long waits. Vallejo Glaze Medium produces a more matte surface and a longer working window, which suits careful correction work where you want time to adjust. Treating "glaze medium" as one thing is a mistake beginners make repeatedly.

The medium does not do the skill

The skill is knowing how thin to make the mix — and there is no universal ratio. Every paint has different pigment density. A dark, highly pigmented ink may need a 5:1 or 6:1 medium-to-paint ratio. A light layer paint may be close at 2:1. The test is visual: on your palette, the mix should show barely a tint, not a noticeably coloured fluid. Always test before touching the model.

Without glaze medium yet: start with water-thinned paint on a wet palette. Keep your mix conservative, test every pass, and work in thin layers. The results will be less consistent, but you will develop the feel for what you are trying to achieve — which is the prerequisite for the medium to help you at all.

This claim persists because the two products are both translucent and look superficially similar. But glaze medium and Contrast medium are designed to make paint move in opposite directions on a surface.

How they differ in practice

Glaze medium behaves as though formulated to keep paint still — it slows drying and discourages aggressive flow, which is exactly what you want for even correction glazes. Contrast medium behaves as though designed to make paint move actively: toward low areas, away from raised surfaces. That is what produces the simultaneous shade-and-highlight effect in a single pass.

The evidence

The Tale of Painters medium comparison, which ran Contrast paint thinned with six different mediums against identical test models, found that Vallejo Glaze Medium made Contrast noticeably more matte and produced stronger, less controlled pooling — not the smooth shade-to-highlight graduation the paint is engineered for. The extended drying time also means paint keeps moving on the model after placement, which removes the control that makes the result consistent.

The reverse mistake

Building a DIY Contrast substitute by mixing regular paint with glaze medium is an equally common error. You can produce a translucent paint this way, and it may work well as a glaze for correction work. But it will not pool and graduate the way Contrast does. You have made a good glaze, not a Contrast substitute.

Practical upshot: thin Contrast with Contrast Medium. Glaze with glaze medium. When GW discontinued their dedicated Glaze paints (Guilliman Blue, Waywatcher Green, Lamenters Yellow, Bloodletter) in 2019 alongside the Contrast launch, the reasoning was that Contrast replaced one specific use case — the initial shaded base-colour pass over a light primer. It was a product rationalisation, not a verdict on the technique. The correction and finishing uses of glazing have no equivalent in the Contrast range.

The thread that runs through all three

GW's product rationalisation contributed to a generation of painters who encountered Contrast before they ever encountered traditional glazing, and who understandably concluded that the older technique had been made obsolete. It had not. Contrast handles the opening pass efficiently. Glazing handles the correction and finishing work. Wet blending is an alternative path to smooth transitions with different tradeoffs. Match the tool to the stage of the job.

The same pattern as last week: understanding what each step is for will always outperform following rules about which product to buy.

If you want to start glazing tonight

You do not need much. A simple first setup:

• Vallejo Glaze Medium (or Lahmian Medium if you paint GW)
• One warm brown — Rhinox Hide or similar
• One flesh tone — Vallejo Flat Flesh works well
• A wet palette to slow drying time

Where to start: faces and cloaks first. Avoid flat armour panels until you have a feel for the technique — even coverage on a large unbroken surface is harder than on the varied geography of a face.

Method: mix more medium than you think you need. Test on your palette first — the glaze should be barely a tint. If the first pass looks dramatic, the glaze is usually too thick. Apply in multiple light passes rather than trying to see immediate results. Let each pass dry before the next. Build gradually.

The goal of the first session is not a finished model. It is seeing what a single thin translucent pass does to finished work. That moment of understanding is what the technique actually is.

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