Journal
Polyresin or fibreglass: what you should know before buying a sculpture
Two materials dominate contemporary decorative sculpture. Their differences concern weight, strength, outdoor use and care.
Published on October 26, 2026 · 5 min read
On the descriptions of decorative sculptures, two words come up again and again: polyresin and fibreglass. They refer to similar materials, often used together, but not identical. Understanding them tells you what you are buying, where the piece can be placed and how to care for it.
Polyresin: a resin filled with mineral
The term polyresin has no standard definition. In decorative sculpture, it most often refers to a synthetic resin, usually polyester, mixed with a powdered mineral filler such as calcium carbonate or stone powder.
How it is worked
The mixture is poured into a mould, often made of silicone, then hardens through a chemical reaction. The mould faithfully reproduces the details of the original model: the folds of a skin, the scales of a crocodile, the facets of a geometric gorilla. Once removed from the mould, the piece is deburred, sanded, primed, then painted or lacquered.
Its qualities
- Precision. Polyresin renders fine detail, which explains its presence in decorative statuary.
- Weight. The mineral filler gives it mass. A polyresin piece is stable, stands firmly on the floor and copes better with the small knocks of daily life, such as being brushed against.
- Surface. Once sanded and primed, it takes glossy lacquers and metallic finishes very well.
Its limits
The more solid a piece is, the heavier it becomes. This is why large polyresin sculptures are often hollow, or combined with a fibreglass structure. Like most rigid materials, polyresin can chip or crack if dropped or struck hard.
Fibreglass: a light and strong composite
Fibreglass, in this context, refers to a composite material: mats or fabrics of glass fibre impregnated with resin, polyester or epoxy. It is also called laminate or glass-reinforced plastic. It is the material of boat hulls, many car body parts and a great many monumental outdoor sculptures.
How it is worked
The sculptor or workshop applies successive layers of fibre and resin inside a mould. The result is a hollow shell, thin and rigid. A surface layer, called gelcoat, or a primer prepares the piece for painting.
Its qualities
- Lightness. At equal size, a fibreglass shell weighs considerably less than a solid piece in filled resin.
- Strength. The fibres give the material good resistance to impact and bending.
- Large formats. It allows pieces several metres high to be made without a heavy internal structure.
Its limits
Very fine details are harder to achieve than with cast resin. And a light, tall piece may lack stability if it is not weighted or fixed to a plinth.
Overlapping vocabulary
In the trade, the two terms are sometimes used interchangeably. Many decorative sculptures combine both: a filled-resin surface for precision, reinforced with glass fibre for strength. A sculpture described as "polyresin" may therefore contain fibreglass, and vice versa. What matters to you are the concrete characteristics of the piece: its weight, its stability, its finish and its intended use.
The finish matters as much as the material
A lacquered sculpture is first and foremost a surface. On a piece in white and gold as on a crocodile lacquered in white, it is the quality of the preparation and the lacquer that determines its appearance and durability.
The stages of a lacquered finish
- Sanding the raw piece to remove moulding defects.
- Primer, which ensures the paint adheres.
- Coats of colour, often applied with a spray gun.
- Protective varnish, gloss, satin or matt.
Chrome or gold finishes rely on different processes, such as metallic-effect paints or reflective coatings, followed by a varnish. The result is more prone to scratches than a solid lacquer. Drip finishes, for their part, layer runs of paint before the final varnish.
At ArtPop, the pieces are sculpted by hand and the finishes are applied by hand, coat after coat. It is this surface work, more than the name of the material, that makes an exceptional piece.
Indoors or outdoors
This is the most frequent question. The answer depends less on the base material than on the finish and the protection applied.
Outdoor risks
- UV. Polyester resins and many pigments can yellow or fade under prolonged exposure to sunlight, especially without a UV-resistant varnish.
- Frost. Water that seeps into a hairline crack can freeze, expand and burst the surface. In Switzerland, winter at altitude is particularly demanding.
- Wind. A light, tall piece must be weighted or fixed.
In practice
For a covered terrace or a conservatory, many pieces are suitable, provided you avoid prolonged direct sunlight and bring them in or protect them in winter. For a garden exposed all year round, ask explicitly whether the piece is intended for that use. If in doubt, keep the sculpture indoors. If you are considering a chalet or a villa, our article on decorating a chalet or villa in Switzerland also covers these constraints.
Everyday care
Caring for a lacquered sculpture is simple, provided you avoid a few mistakes.
- Dust with a dry microfibre cloth or a soft duster.
- For a mark, use a slightly damp cloth, if necessary with a little mild soapy water, then dry.
- Do not use solvents, alcohol, abrasive products or scouring sponges.
- Avoid glass or furniture cleaners that contain harsh agents.
- On a chrome or gold finish, wipe without rubbing hard.
Moving and handling
- Always lift the piece by its main body, never by a thin part: tail, ears, arms, jaw.
- Above one metre, plan for two people.
- Wrap the sculpture in thick blankets for the journey and wedge it so that it cannot slide.
- Place it on a flat, stable surface. On delicate parquet, felt pads under the base prevent marks.
Questions to ask before buying
Before you decide, a few simple questions will clarify the purchase:
- Is the piece solid or hollow, and what is its approximate weight?
- Is it intended for indoor use only, or also for sheltered outdoor use?
- What finish has been applied, and with which varnish?
- How should it be cared for, and what should be done if it chips?
- Is the base stable, or is a plinth required?
This information matters more than the material label. It is also easier to check by seeing the piece. At the Aubonne hall, the sculptures of each vernissage are shown in person over two days. Club members can pre-reserve a piece online with a 30% deposit, then collect it on site, like all buyers.
