Apply Specialized Finishes and Decorative Effects
This domain tests decorative and protective finishes beyond a plain flat coat: faux wood grain, marble, stucco and texture, sponging, ragging, stencilling, metallic and glazed effects, stains, varnishes and clear coats.
Core rules
- Agree a sample board or mock-up with the client before starting. Record base colour, glaze colour, tools, layers and sheen.
- Work in layers: base coat, ground coat, glaze or texture, then clear protective coat. Each layer must be compatible with the one below and fully cured as specified.
- Control open time. Glazes and scumbles are workable only while wet; adding the recommended extender slows drying, but too much can weaken the film.
- Use the right tool for the effect: flogger, dragging brush, sponge, rag, stipple pad, stencil brush, trowel or spray texture hopper.
- Protect edges and adjacent surfaces; decorative work is judged against the approved sample, not against memory.
- Clear coats must be chosen for the service environment; an interior varnish is not an exterior finish.
Worked example
A faux-marble panel is specified. The approved sample has a light base, grey veining and a satin clear coat. The applicator applies the base, then glazes and draws veins with a feather. If the glaze skins over, the veins tear. The correct approach is to mix a small batch, add the approved extender, work one panel at a time, and seal only after the glaze is fully dry. The reasoning is that the effect depends on controlled wet blending; rushing or adding incompatible thinner destroys it.
Traps
- Starting without an approved sample.
- Applying a solvent clear coat over an uncured waterborne glaze.
- Using too much extender and producing a soft, tacky film.
- Ignoring site light, which changes how the effect reads.