The Secrets Potters Don't Often Share

After years in the studio, every potter accumulates a treasure trove of tricks that transform frustrating problems into simple solutions. These are the tips shared between ceramicists and the problem-solvers that veteran potters use daily.

Today, I'm sharing the tips I believe will help take your hand-building from good work to exceptional pieces. These aren't basic techniques—these are the solutions that save cracked pieces, create bulletproof joins, and solve those maddening problems that books don't always address.

These are the same professional hand-building techniques I teach in my Cowaramup studio, where students learn how to prevent cracks, create stronger joins, and work confidently with clay from the very beginning.

What's the #1 Secret Professional Potters Use?

Magic Water—a simple mixture of water, sodium silicate, and soda ash that creates bonds stronger than the clay itself. It's the secret weapon for attaching handles, joining slabs, and preventing cracks that plague beginners.

The Game-Changing Secrets

1. Magic Water: The Professional's Secret Weapon

What it is: A liquid that increases the strength of a bond when you join two pieces of clay, made by combining 1 gallon of water, 3 tablespoons of sodium silicate, and 1.5 teaspoons of soda ash.

Why professionals swear by it: The sodium silicate acts like glue—it's sticky and dries hard, creating a strong bond as the clay dries. The soda ash and sodium silicate both contain sodium which is a flux that lowers the melting point, helping the clay stay bonded when it's fired.

How to make it:

For a practical studio-sized batch:

• 2 cups distilled water
• 1½ teaspoons liquid sodium silicate
• ¾ teaspoon soda ash (also called sodium carbonate)

Mix the soda ash into warm water first until dissolved, then add the sodium silicate. Store in a labeled jar.

When to use it:

• Attaching handles to mugs and pitchers
• Joining slab seams that need extra strength
• Welding coils together in coil pottery
• Any time you're joining leather-hard to leather-hard clay
• When regular slip just isn't creating strong enough bonds

Pro tip: Apply Magic Water with an old toothbrush. Score both surfaces deeply, brush on the Magic Water, then press firmly together. The bond will be stronger than the surrounding clay.

Hidden secret: Magic Water is also a deflocculant, making the molecules on the surfaces being joined repel each other—think thinner, more liquid-y and better for mixing together. This means it penetrates deeper into scored surfaces than regular water or slip.

2. The Vinegar and Paper Clay Miracle Fix

The problem: You've discovered a crack in bone-dry clay. Your heart sinks. Traditional slip won't work because wet clay doesn't stick to bone-dry clay.

The professional solution: Paint a little bit of vinegar on the crack, gently work it into the crack, and apply a layer of paper clay slip over the area.

How to make paper clay slip:

Make a small amount of very thick slip with the same clay your piece is made of. In another container, cover a wad of toilet paper with water and let it sit until the paper has broken down into pulp. You can speed this up with an immersion blender.

Wring out excess water from the paper pulp and mix it with your thick slip. The consistency should be like sticky putty.

Why it works: The vinegar flocculates the edges of the break, making the clay soften without absorbing much water. The paper fibers act as reinforcement, creating a repair that's flexible yet strong. As the piece dries, the paper burns away in firing, leaving only the clay behind.

Application technique:

1. Score the crack deeper and wider than the crack itself
2. Paint vinegar into the scored area
3. Pack the paper clay slip firmly into the crack
4. Smooth with a damp sponge
5. Let dry very slowly under plastic

Critical note: This works for bone-dry pieces. For leather-hard cracks, use the scoring and soft clay method described below.

3. Vinegar as a Bonding Agent

The secret: Plain white vinegar is one of pottery's best-kept secrets for joins and slip.

How professionals use vinegar:

For attaching pieces: Vinegar can be used to improve the joints when attaching clay—it acts as a flocculant that makes the particles in the clay attract to each other. Simply paint a small amount on both scored surfaces before joining.

For making super-sticky slip: Add a tablespoon of vinegar per cup of slip. The vinegar makes the slip really sticky and works so much better for attaching handles and appliqués.

For preventing glaze settling: You can use vinegar to make your glazes gel almost instantly to eliminate drips and help them suspend better—maybe a capful or two.

Why it works: Vinegar changes the pH of the clay, causing the clay particles to attract and bond more tightly. Unlike water, it doesn't excessively hydrate the clay, preventing the swelling that can make cracks worse.

Pro warning: A little goes a long way. Too much vinegar can over-soften clay and create a goopy mess.

4. The Sugar Clay Crack Filler

The problem: Wide cracks in nearly dry pieces that are too dry for regular repair methods.

The professional solution: Take a small amount of clay that has dried out until it crumbles, add an equal volume of caster sugar, and mix together with your fingers. The sugar will soften and plasticize the clay.

How to use it:

1. Scrape out the crack down to solid clay
2. Wet the edges with a little vinegar
3. Work the sugar clay mixture into the crack
4. Smooth flush with the surface

Why it's brilliant: The fine caster sugar adds plasticity rather than water, and the sugar clay mix will have much lower shrinkage than wet clay. The sugar burns away completely during firing.

When to use it: Best for unglazed pieces or areas that will be carved or textured after repair. Not ideal for smooth glazed surfaces.

5. The Secret to Crack-Free Leather-Hard Repairs

The counter-intuitive fix: While it may seem counterintuitive, the best way to remedy a developing crack is to open it up more.

Professional technique:

1. Score the area deeper and wider than the crack itself
2. Place scored soft clay into the enlarged space
3. Compress firmly with a rib tool
4. Wrap in plastic to equalize moisture

Why this works: Clay has a memory—in an effort to erase the memory of a crack, score the area deeper than the crack itself, then compress soft clay into the space. This completely resets the clay's structure.

Critical rule: Be very wary of adding water to a crack at any time—water can swell the crack and lead to growth of the crack, not eliminate it. Always use moist clay instead of water.

6. Spooze: the Heavy-Duty Bonding Agent

What it is: A super-strong bonding agent made from vinegar, corn syrup, and bone-dry clay.

Recipe: Mix together 1 part white vinegar and 1 part corn syrup, then add enough crumbled-up bone dry clay to make a slurry-type slip that has the consistency of chocolate mousse.

When to use it: Spooze is particularly good for:

• Joining very dry pieces
• Attaching decorative elements to leather-hard pieces
• Emergency repairs when Magic Water isn't available
• Creating bonds between different clay bodies

How to prepare: Mix the vinegar and corn syrup together first, then add bone-dry clay. Leave overnight to allow the clay to fully slake down into the liquid.

Professional insight: The corn syrup adds flexibility and strength, while the vinegar prevents water absorption that could cause cracking. Together they create a bond that can handle significant stress.

7. The Flour/Cornstarch Stamp Release Secret

The frustration: You press a beautiful stamp into clay and it sticks, pulling up the surface and ruining your design.

The simple fix: Dust a light layer of flour or cornstarch over your slab before stamping, and your stamps will come off cleanly, leaving behind crisp, beautiful designs.

Why it works: The starch creates a microscopic barrier between stamp and clay without affecting the clay's ability to bond or the glaze's ability to adhere.

Pro tip: Keep a small salt shaker filled with cornstarch at your work station for quick dusting. It's cleaner and more controlled than using a bag.

8. The Sponge-On-a-Stick Game-Changer

The problem: Cleaning and smoothing the inside of tall vases, narrow-necked bottles, or deep forms feels impossible.

The professional solution: DIY a sponge on a stick with a dowel and a regular round sponge, and suddenly those hard-to-reach spots are no longer a problem.

How to make it:

• Purchase a wooden dowel (½" diameter works well)
• Cut a natural or synthetic sponge into a cylinder
• Push the dowel into the center of the sponge
• Secure with a small screw or wire if needed

Professional variations:

• Make multiple with different sized sponges
• Create one with a pointed sponge for narrow necks
• Keep one always damp for interior smoothing

Hidden use: Use your sponge stick to apply water or slip to interior surfaces you can't reach by hand.

9. The Double-Scraping Secret

What professionals know: Scraping the pot walls is critical for hand building—scraping helps to refine the overall vessel shape, thin wall thickness, and leave a more consistent surface. Professionals usually scrape twice: once right after forming and another more vigorous scraping after the pot has set up and is approaching leather hard.

Why twice?

• First scraping (soft clay): Removes obvious lumps, evens out wall thickness, refines basic form
• Second scraping (leather-hard): Creates smooth, professional surface finish, refines curves, removes subtle irregularities

The tool: Use a metal rib, kidney, or even a metal credit card. The edge should be smooth but not sharp.

Professional technique: Hold the scraper at a 45-degree angle and use firm, consistent pressure. Work from bottom to top in long, smooth strokes. Let the clay shavings fall away—don't try to smooth them back in.

10. The Bonding Pinch for Coil Pottery

The single most important technique: When making coil pottery, there is no technique as important as your bonding pinch—this is the pinch used to bond the coil to the wall of the pot, which holds everything together through the stresses of drying, firing, and use.

How to do it correctly: Use the index finger on the outside of the vessel to press down and slightly into the body. This creates a mechanical bond that fuses the coil to the wall.

Professional insight: The bonding pinch should compress the clay, not just smooth it. You're literally welding the coil to the pot body. If you can see distinct coil lines on the interior after bonding, you haven't compressed enough.

Follow-up: After bonding all coils, use a rib tool on both interior and exterior to further compress and smooth the joins.

11. The Compression Pinch for Shaping

The secret to elegant forms: The compression pinch is key to shaping—use both hands along the pot wall like performing a standard flat pinch, then bring hands together slightly forming a slight pleat in the clay wall.

What it does: This technique allows you to bring walls inward, creating narrow-mouthed jars, elegant curved vessels, and sculptural forms that would be impossible to throw on the wheel.

When to use it: After you've built up straight walls with coiling, use the compression pinch to:

• Create curved belly forms
• Narrow the neck of a vase
• Add organic, asymmetrical curves
• Shape decorative rims

Professional tip: Work gradually, making small adjustments with each compression pinch. Moving too fast creates pleats that are difficult to smooth out.

12. The Hidden Crack Inspection

What beginners miss: Don't forget to check for hidden cracks in areas that are difficult to see, like the underside and interior of your pottery piece.

When to check:

• Before bisque firing
• After attaching handles or spouts
• When moving a piece from wet to leather-hard
• Before glazing

How to inspect: Run your fingers slowly over every surface, especially:

• Undersides of bowls and plates
• Interior corners where walls meet
• Areas around handles and attachments
• Any spots that were compressed or stressed

Why it matters: A tiny crack you miss becomes a major break in the kiln. Five minutes of inspection can save weeks of work.

13. The Work Surface Secret

What professionals know: Roll coils on unvarnished wood or canvas, never on shiny countertops where clay sticks.

Why it matters: Absorbent surfaces create the perfect amount of friction for rolling even coils without sticking. Slick surfaces cause clay to slide around rather than roll, creating uneven, tapered coils.

Best surfaces for different techniques:

• Coil rolling: Unvarnished wood, canvas, or concrete
• Slab rolling: Canvas or slab mats
• Wedging: Plaster, concrete, or canvas over wood
• Pinch pots: Slightly absorbent wood surface

Pro investment: A large canvas drop cloth over your work table creates the perfect work surface for all hand-building techniques.

14. The Template Duplication Trick

For consistent work: Cut templates from heavy cardstock for slab projects—this allows you to duplicate successful pieces exactly and maintain consistency across a series.

How to create templates:

1. Make your first piece and refine it to perfection
2. Trace the final shape onto heavy cardstock or thin plywood
3. Cut out carefully and label (include thickness notes)
4. Store templates flat with your studio supplies

Professional uses:

• Creating matching dinnerware sets
• Producing consistent forms for wholesale orders
• Teaching others your successful designs
• Scaling pieces up or down proportionally

Hidden benefit: Templates eliminate the mental effort of "figuring it out again" each time, letting you focus on surface decoration and refinement.

Frequently Asked Questions

What's the difference between Magic Water and regular slip?

Magic Water is much thinner than slip and penetrates deeper into scored surfaces. It's a deflocculant that makes molecules on the joining surfaces repel each other, creating a better bond than traditional slip. It also requires less cleanup and won't add bulk to seams.

Can I use regular vinegar from the kitchen?

Yes! Plain white distilled vinegar works perfectly. Don't use apple cider vinegar or specialty vinegars—you want pure acetic acid without added colors or flavors.

How long does Magic Water last?

Indefinitely if stored in a sealed container. The sodium silicate might settle to the bottom over time—just shake it up before use.

Why can't I just add water to cracks?

Water swells the crack and can lead to growth of the crack rather than fixing it. Water causes clay to expand temporarily, making you think the crack is fixed. As it dries and shrinks, the crack returns worse than before.

What's the biggest mistake beginners make with joins?

Not scoring deeply enough. Shallow scratches don't create enough surface area for a strong bond. Score aggressively—deeper than feels comfortable—and apply your bonding agent generously.

Can I use these techniques with any clay body?

Yes! Magic Water, vinegar, paper clay slip, and spooze all work with earthenware, stoneware, and porcelain. The principles of proper joining are universal.

Is paper clay slip safe to fire?

Absolutely. The paper fibers burn away completely during firing, leaving only the clay behind. There's no residue, no toxic fumes, and no effect on glazing.

Do I need to make all these special solutions?

No—start with one. Magic Water is probably the most versatile and worth making first. As you encounter specific problems, add other solutions to your toolkit. Many professional potters use only 2-3 of these techniques regularly.

The Bottom Line

These aren't party tricks—these are the battle-tested solutions that professional hand-builders rely on daily. They're the difference between pieces that crack in the kiln and pieces that survive for generations. They're the secrets that turn frustrating problems into simple fixes.

The beautiful thing? Most of these solutions use ingredients you can find at the grocery store or pharmacy. No exotic materials, no expensive equipment—just clever chemistry and decades of studio wisdom distilled into simple techniques.

Start with Magic Water. Master the bonding pinch. Learn to scrape twice. These three techniques alone will transform your hand-building practice. Add the others as you need them, building your own arsenal of professional problem-solvers.

Remember: every professional potter has cracked pieces, botched joins, and studio failures. The difference is, they know how to fix them. Now you do too.

Ready to put these professional techniques into practice? In my Cowaramup studio in Margaret River, I teach beginner-friendly hand-building ceramics classes where all of these insider methods are demonstrated step by step—no experience or tools required.