Cotton vs Linen vs Polyester Canvas: Which Stays Tight?

Most artists are offered two choices of canvas: cotton or linen.

Polyester, if it comes up at all, is treated as the lesser third option, a craft fabric or a print stock.

The short answer: cotton and linen are both plant fibres, and both respond to changes in humidity.

PET polyester does not respond much to moisture, so it stays tight. Regular polyester has one weakness: its smooth fibres give paint little to grip. ACF's proprietary coating was developed to fix exactly that.

Here is the comparison, what the conservation literature says, and what artists who have switched actually report.

---

What is the difference between cotton, linen and polyester canvas?

The difference is the fibre.

Cotton and linen are cellulose, which takes up moisture from the air. Polyester PET (polyethylene terephthalate) is a fibre that does not respond much to moisture.

But fibre is only half of it. Regular polyester and ACF canvas share the fibre. What separates them is the coating.

The fibre solves the moisture problem. It does not solve grip. That is what the coating is for.

---

Why does cotton canvas sag?

Cotton sags because it is a plant fibre that responds to humidity. Chapter 5 of The Conservation of Easel Paintings records that both linen and cotton supports respond significantly to changes in relative humidity, and that prolonged high humidity leads to mould and degradation of the canvas.

Cotton won because it was white, cheap and everywhere. For a weekend study, that is fine. The problem starts after the weekend: soft corners and a surface that moves. Cotton and cheap linen will tell on themselves within a week.

If you sell, ship or store work, that slack is a defect you paid for.

"As a fluid artist I find it difficult to maintain the tension with traditional canvases but these bad boys are just next level plus the flow of the paint over them is way much smoother than a cotton one!"
Artist, Derby, UK

---

Is linen canvas worth the money?

Linen is worth it if the feel of linen is the point of painting for you. It is not worth it if you are buying it to stop your canvas moving, because linen is still cellulose and still responds to humidity.

Linen earned its reputation. Longer fibres, a tighter weave, and a hand many oil painters prefer. What it does not buy you is immunity. It still asks for sizing and a ground if you buy it raw, and it still wants a room you control.

If that is the canvas you love, buy linen and manage the studio. That is a coherent choice. It is not the only one.

Want the tension without the climate control? See the deep edge range, 300gsm PET Polyester on a strainer that holds its shape.

---

Is polyester canvas good for painting?

Coated PET polyester is good for painting. Bare, smooth polyester is not, because paint has nothing to grip. The difference is the coating.

That adhesion question is the real weakness of polyester, and we cover it in full, with the conservators and the 1957 patent that identified it, in Does paint stick to polyester canvas?

The reason polyester PET belongs in the same conversation as linen is stability. The same conservation reference text concludes that polyester PET "exhibits the best combination of properties" as a starting point for a better artists' canvas, "even though it has yet to match linen or cotton kinaesthetically or aesthetically."

That last clause is the honest argument.

Stability comes from the fibre.

Feel is what has to be engineered, through the coating and the build.

---

How long does polyester canvas last?

Polyester fabric is exceptionally stable. In accelerated ageing tests published by the Victoria and Albert Museum, polyester fabrics showed no measurable loss of tensile strength after light exposure calculated as equivalent to roughly 80 years of museum display.

The same study, by Capucine Korenberg, then heat-aged the samples at 60°C for three months and 80°C for a further two months. Tensile strength was still unchanged. Read the study.

What we can add from our own side: we have supplied our MDF stretchers to the photographic industry since 2013, and none has ever come back.

 The full story of how that strainer was built is in Art materials were reinvented by science. Canvas wasn't.

"The canvas never sags, offers a paint-ready surface and is light and practical for shipping."
Artist, Durban, South Africa

---

What does polyester canvas feel like to paint on?

ACF canvas is smooth with tooth. There is no ridge at the edge, so a line can run straight off the face.

Plenty of artists take to it immediately. Derek had been adding extra gesso to a professional cotton canvas for years:

"Up to now I have been using [a leading manufacturer's] professional fine cotton canvas. I had to use at least 2 extra coats of Gesso. But on your Canvas I decided to just go ahead without touching it and I'm smitten with it so smooth."
Derek H., artist

Painters coming from years of linen sometimes take a little longer, and we would rather tell you that than pretend otherwise:

"This is (for me), a new surface and I'm beginning to get to grips with it. I've had to adjust and adapt slightly, but nothing too drastic - the paint moves over the drum-tight surface really well and I'm producing some quality work."
Experienced oil painter, Stoke-on-Trent, UK

For a long-form account from an oil painter who compared it directly with linen and cotton duck, read Robert Jones on ACF canvas. For wildlife oils in seven stages, see Daniel Wilson in The Artist.

If after a few paintings you still want the give of linen, use linen. We are not trying to convert a preference. We are trying to stop sag being treated as normal.

---

Which canvas should I use for oils, acrylics or watercolour?

Choose by what you paint, not by the romance of the fibre.

Oils. You want a face that holds a glaze and a support that does not move while the paint cures. Box Canvas (40mm), or Box Board Canvas for a rigid surface with no bounce. If you are wondering whether a rigid back matters, read Does a canvas need a backing board?

Acrylics, pouring and classes. Packs that arrive ready and stay square. Stretch Canvas (20mm) or the bundles.

"I do Acrylic Paint Pouring and the canvas is perfect and no sagging, at all."
Artist, Durbanville, South Africa

Watercolour, ink and gouache. Watercolour Canvas was developed by ACF. It needs no ground, is used as supplied, and does not warp.

Work that has to hang. Oak floating frame sets, canvas and frame matched and ready to hang.

---

Do I need to prime a polyester canvas?

Not an ACF canvas. It arrives coated, and the coating is the ground.

Some artists like a toned canvas. For oils, we suggest a wash of mineral turps, linseed oil and colour.

Others prefer a coloured acrylic base.

That's the beauty of our canvas: you don't have to, but you can if you want to.

The watercolour canvas is used exactly as supplied.

"Excellent quality, perfectly straight, solid no warping, no need to prime."
Artist, Leiston, UK

---

Why not a cotton and polyester blend?

ACF canvas is 100% Polyester PET in the warp and the weft. A single polymer is straightforward to recycle. Poly-cotton blends are much harder, because the two fibres have to be separated first, and very few facilities can do that.

---

What this comparison is not

It is not "plastic is always better." It is not "linen is fake prestige." And it is not a claim that polyester PET has a five-hundred-year track record as a painting support. It does not.

It is a canvas you can test yourself. Paint on it, leave it in a normal room, and tap it again later. Every ACF canvas is 100% guaranteed on materials and workmanship.

ACF canvases are designed and manufactured in South Africa, where we started in 2013, and sold through ACF Canvas in the UK, USA and South Africa.

You can read hundreds of reviews from artists in all three countries on our reviews page.

Read next

• Why Polyester PET is the best artist canvas material. The full case, with sources.
• Does paint stick to polyester canvas? The one honest weakness, and how it is solved.
• The history of polyester canvas. 1941 to now.
• Marion Dutton of MazArt Studio on ACF Stretch Canvases. A professional artist, in her own words.

---

Or put it next to your cotton and linen

Two places to start. Both are 100% Polyester PET in warp and weft, pre-coated with our own gesso, on a strainer that holds its shape.

---

Sources

• Young, C., "History of Fabric Supports", chapter 5, in Stoner, J.H. & Rushfield, R. (eds.), The Conservation of Easel Paintings, Routledge / Taylor & Francis, 2012.
• Korenberg, C. (2003) "How fast do polyester fabrics age in the museum environment?", V&A Conservation Journal, Issue 44, Victoria and Albert Museum. Link
• Customer reviews from ACF Canvasses Happy Clients, and a customer email quoted with permission.