Why the Coil Method Deserves a Second Look

Coil pots have an unfair reputation. Somewhere along the line they became the beginners' exercise, the thing you do before you're allowed near the wheel. That's a shame, because the coil method is arguably the most flexible way to build in clay. You can make a pot the size of a teacup or a planter big enough to sit in, and you can make it round, oval, square, or gently asymmetrical. Try that on a wheel.

The catch is that coils will only behave if the walls stay even. Uneven walls sag, crack at the joins, and dry at wildly different rates. Get the wall thickness consistent from the base to the rim and everything else — shaping, drying, firing — becomes dramatically easier.

Start with Clay You Can Actually Push Around

Before a single coil is rolled, the base matters. Roll or press a slab roughly 8–10mm thick and cut a disc or oval for the floor. If you're building a tall pot, make the base a little thicker than the walls, around 10–12mm, so it can carry the weight above.

Leave that base to firm up to soft leather hard. It should hold its shape when you lift an edge but still take a fingerprint if you press firmly. Working onto a wet base is the fastest way to end up with a slumping pot.

Your clay body should be soft enough to roll without crumbling but firm enough to hold a coil shape. If it's too sticky, spread it out on a plaster bat for twenty minutes. If it's too stiff, wedge in a little water — sparingly. A good test is to roll a sausage and stand it upright; it should bow slightly but not collapse.

Rolling Coils That Behave

Coils of consistent diameter make even walls far easier to achieve, so don't treat rolling as a warm-up. Do it properly:

• Work on a clean, slightly porous surface — canvas or plaster is ideal, as it stops the coil sticking and stretching.
• Start with a lump about the size of a small lemon and roll with the flat of your hand, fingers relaxed, moving from the centre outwards.
• Aim for coils around 1cm thick. Thinner coils dry too fast and crack; thicker ones squash unevenly.
• Roll a few at a time and keep the spares under a damp cloth or a plastic bag.

Don't roll a coil longer than you can comfortably use in one pass. Long coils kink, and a kinked coil almost always means a thin spot in the wall.

Joining with Slip and Blending as You Go

This is where the pot is won or lost. Never simply press a dry coil onto a dry pot and hope.

Score the top edge of the wall with a fork, a needle tool, or a serrated rib. Paint on slip — mixed to the consistency of double cream, not milk — and press your coil into place. Work around the pot in short sections rather than trying to seat an entire ring at once.

Then blend. Use your thumb on the inside and a wooden rib or your fingers on the outside, pressing the coil downward and outward to merge it into the wall below. You're not just smoothing the surface; you're physically fusing the coil into the body. Work your way around the whole ring before adding the next one, and rotate the pot regularly so you're not always working at the same comfortable angle.

If the pot starts to feel floppy, stop and let it firm up for fifteen or twenty minutes. There's no prize for speed.

Keeping the Walls Even

Even walls are mostly a matter of measuring rather than feeling. Two tools help enormously: a pin gauge (a needle set into a block of wood) and your own fingers, used as callipers on the rim.

• Check thickness at four points around the rim each time you finish a coil. If one side is thicker, blend it a little more before continuing.
• Aim for 6–8mm walls on most domestic pots. Anything under 5mm gets fragile; anything over 12mm is heavy and slow to dry.
• Support the inside with one hand while you shape the outside. Unsupported pressure thins the wall where you least expect it.
• Turn, don't reach. A banding wheel or a simple bat you can spin keeps your hand angle consistent all the way round.

If you want to widen or narrow the profile, do it gradually over several coils rather than forcing a dramatic curve in one go. A gentle taper maintains even thickness; a sharp shoulder tends to thin out on the outside of the bend.

Shaping, Drying and Finishing

Once the walls are up, refine the form with a rib — metal for compressing, rubber for smoothing. Compressing the surface with a rib while the clay is still soft aligns the particles and reduces cracking later on.

For the rim, fold or press the top coil inward to create a rounded edge rather than leaving it as a flat cut. It looks better and it's far less likely to chip.

Drying is the quiet test of everything you've done. Cover the finished pot loosely with a plastic bag and let it dry slowly over several days, uncovering it a little more each day. Even walls shrink evenly; uneven ones tear themselves apart at the thinnest point.

Work slowly, measure often, and blend every coil as though the pot depended on it — because it does.