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Lesson 1 · Module 5

Formula Behaviour

Predict how a product will behave, and why it fails.

You don't need a lab. You need to think about the whole system you're layering, not a slogan.

Core doctrine

Understand the layer beneath before you add the next one. ("Like over like" is a beginner shortcut that creates false rules.)

The three live rules to retain

  1. Thin layers generally perform better than one heavy layer.
  2. Allow one layer to settle before disturbing it with another.
  3. When something fails, diagnose quantity, timing, friction, tool action and formula behaviour before blaming one product.

Why product "pills"

Usually several things at once: too much product, too many layers, disturbed film formation, insufficient settling time, friction from the tool, or genuinely incompatible textures. Diagnose the actual cause.

Reference

Formula vocabulary (don't memorise as equal-weight facts). Emulsions, volatile carriers, emollients, silicones, oils, waxes, humectants, film formers, powders, pigments. It's the combination, not one word on the label, that decides behaviour and compatibility.

Layering & mixing that works

Give each layer time to set; wet before dry (creams first, then powders, powder locks the layer beneath); custom-mix compatible formulas for depth/undertone; sheer coverage with a hydrator; use a mixing medium (not water) to intensify a pigment. Build sheer, in layers, two thin passes outlast one thick one.

Attention reset

Diagnose the pill. Show a pilled result. Students list causes (too much product? no settling time? friction? too many layers? film disrupted? incompatibility?). "The products don't work together" cannot be the only answer.

Key terms
Emulsion
A stable mix of oil and water phases held together by an emulsifier, the base structure of most creams and liquids.
Volatile carrier
A component that evaporates after application, carrying product onto the skin then leaving the rest behind to set.
Film former
An ingredient that dries to a continuous film, giving wear and transfer resistance once the layer has settled.
Humectant
A water-attracting ingredient that draws and holds moisture, adding slip and hydration to a layer.

A foundation layer starts to pill and roll under the sponge on the wedding morning. Before you blame the products, what should you diagnose first?

Correct. Pilling is usually several things at once, too much product, too many layers, disturbed film, no settling time or friction. Diagnose before blaming one product.
Re-read the live rules and the attention reset: "the products don't work together" cannot be the only answer. Diagnose quantity, timing, friction, tool action and formula behaviour first.
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