How Much do Pottery Slips Cost?
By Linda · · 7 min read
Pottery slips typically cost $5 to $30 per pint, depending on the brand, the colorant used, and whether you buy a basic casting slip or a colored decorating slip. A pint goes a long way for surface decoration. Most potters spend far less on slip in a year than they do on glaze or clay.
If you mix your own slip from reclaimed clay scraps, the cost drops to nearly nothing, which is why I always tell new potters to learn that skill early.
What a Pottery Slip Is
A slip is liquid clay: clay particles suspended in water, sometimes with colorants or deflocculants added. Potters use slips for three main jobs:
- Decorating: brushing, trailing, or dipping colored slip onto leather-hard pots before bisque firing.
- Joining: scoring and slipping handles, spouts, and attachments together.
- Slip casting: pouring deflocculated casting slip into plaster molds to form whole pieces.
The job determines the price. Joining slip is free because you make it from your own clay scraps. Decorating slips and casting slips are the ones you pay for, and they sit in that $5–$30 per pint range. If you want to see slip decoration at its best, the whole tradition of slipware pottery is built on this one material.
Typical Slip Prices by Type
Here is what you can realistically expect to pay at pottery suppliers. Exact prices vary by supplier and region, but these ranges hold up well:
| Type of slip | Typical cost | Notes |
|---|---|---|
| Joining slip (homemade) | Free | Made from your own clay scraps and water |
| White/buff casting slip | $15–$30 per gallon | Cheapest per volume; sold for mold casting |
| Colored decorating slip | $8–$20 per pint | Price rises with stain content |
| Specialty colors (pinks, purples, true reds) | $15–$30 per pint | Inclusion stains and cadmium-based colors cost the most |
| Dry slip/engobe mix | $10–$25 per 5 lb bag | Cheapest colored option per finished pint; you add water |
| Underglaze (the common substitute) | $4–$12 per 2 oz jar | Pricier per ounce, but more concentrated color |
The pattern is the same one you see with pottery glaze costs: the base material is cheap, and the colorant is what you are really paying for.
What Drives the Price Up or Down
Colorant
This is the biggest factor by far. White and buff slips are just liquid clay and cost very little. Colored slips contain ceramic stains or oxides, and some pigments are genuinely expensive to manufacture. Reds, pinks, and purples made with inclusion or chrome-tin stains routinely cost two to three times what a basic black or blue does.
Quantity
Slip gets much cheaper per ounce as you size up. A 2 oz jar might work out to $40+ per pint equivalent, while a gallon of the same color could land under $10 per pint. If you use one color constantly, buy the bigger container.
Wet vs. dry
Dry slip and engobe mixes cost less per finished pint because you’re not paying to ship water. The tradeoff is ten minutes of mixing and sieving. For a production potter, dry mixes are the obvious choice.
Firing range
Slips formulated for a specific firing range, whether low-fire around cone 06–04 (1828–1945°F / 998–1063°C) or mid-range cone 5–6 (2167–2232°F / 1186–1222°C), are fairly standard in price. What matters is matching the slip to your clay body’s firing temperature; a mismatched slip can flake or shiver off, and that wasted work costs more than any jar of slip.
How Much Slip Do You Really Need?
Less than you think. Slip is applied in thin layers, usually one to three coats on leather-hard clay.
- A pint of decorating slip will comfortably cover 20–40 mugs with brushed decoration.
- A gallon of casting slip yields roughly 8–12 small to medium cast pieces, depending on wall thickness.
- Slip trailing uses tiny amounts — a pint can last a hobbyist a year or more.
For a hobby potter doing surface decoration, $30–$60 per year on slips is a realistic total budget. Compared to clay, glaze, and firing fees, slip is one of the smallest line items in overall pottery costs.
Making Your Own Slip (the Cheapest Option)
Homemade slip costs pennies, and for joining and basic decoration it works just as well as commercial slip.
Basic decorating slip:
- Save bone-dry scraps of the same clay body you throw with.
- Break them up and cover with water; let them slake down for a few hours.
- Mix to a heavy-cream consistency and pass through an 80-mesh sieve.
- For color, add 5–15% ceramic stain or oxide by dry weight, then sieve again.
Using your own clay body guarantees the slip shrinks at the same rate as the pot, which is the main thing that prevents flaking. Stains are the only real expense (typically $5–$20 for a small bag), and one bag colors a lot of slip. If you’re buying clay anyway, this is close to free material; see what pottery clay costs for context on the raw material.
One caution: casting slip is a different recipe. It needs deflocculants (sodium silicate and soda ash) measured carefully, so I recommend buying commercial casting slip until you’re comfortable testing specific gravity.
Slip vs. Underglaze: Which Is Cheaper?
Beginners mix these up constantly, and the cost math is different.
- Slip is liquid clay. It must go on damp or leather-hard clay, it adds physical thickness, and it’s cheap per volume. Best for trailing, sgraffito, marbling, and covering large areas.
- Underglaze is mostly colorant with a little clay. It can go on bone-dry clay or bisque, and it costs more per ounce but the color is very concentrated. Best for detailed painting.
If you’re decorating broad areas or carving through layers (sgraffito), slip is the cheaper material. If you’re painting fine detail on bisque, underglaze wins despite the higher per-ounce price because you use so little. Most potters end up with both, and the combined spend is still small next to tools and equipment. For the bigger picture, here is what pottery tools cost.
Where to Buy Slips and How to Save
Pottery supply stores, online ceramic retailers, and some local studios all sell slips. A few habits that keep the cost down:
- Buy dry when you can. Mixing your own from powder saves 30–50% on colored slips.
- Watch shipping. Wet slip is heavy, and shipping can double the price of a single pint ordered online. Buy locally or batch your orders.
- Share gallons. Casting slip in particular is cheapest by the gallon or 5-gallon bucket; splitting one with studio mates beats everyone buying pints.
- Reclaim everything. Slip doesn’t really go bad. Thickened slip revives with water and a quick re-sieve, and even dried-out slip can be slaked back down.
Store slips in airtight containers with the lids fully sealed. A splash of water on top before closing the lid keeps a working slip usable for months. If you keep slip alive instead of replacing it, your real annual cost stays tiny. That’s one of many reasons pottery doesn’t have to be an expensive hobby.
Mistakes That Waste Slip (and Money)
- Applying to clay that is too dry. Decorating slip belongs on leather-hard clay. On bone-dry work it often cracks and peels off, ruining the decoration and sometimes the pot.
- Wrong consistency. Too thick and it cracks as it dries; too thin and the color fires out pale, forcing extra coats. Aim for heavy cream.
- Mismatched clay bodies. A porcelain slip on a high-shrinkage stoneware can pop off during drying or firing. When in doubt, make slip from your own clay body and color it.
- Buying tiny jars of a color you use constantly. The per-ounce premium on small jars adds up fast. Test with small jars, then commit to pints or dry mix.
FAQ
How much does a pint of pottery slip cost?
Most colored decorating slips run $8–$20 per pint, with specialty colors like reds and pinks reaching $30. Plain white or buff slips sit at the bottom of the range.
Is it cheaper to make your own pottery slip?
Yes, by a wide margin. Slip made from your own clay scraps costs almost nothing, and even colored homemade slip usually costs a fraction of commercial slip. The only real expense is the ceramic stain.
How much does casting slip cost?
Commercial casting slip generally costs $15–$30 per gallon, and noticeably less per gallon when bought in 5-gallon buckets. Porcelain casting slips cost more than white earthenware or stoneware slips.
What is the difference between slip and underglaze cost-wise?
Slip is much cheaper per volume ($8–$20 per pint) but you use more of it; underglaze costs more per ounce ($4–$12 for 2 oz) but the color is concentrated, so a jar lasts a long time for detail work.
Can pottery slip go bad?
Not really. Slip can thicken, dry out, or grow harmless surface mold, but it can almost always be revived with water and a pass through a sieve. Stored airtight, a slip stays workable for years.
How much slip do I need for one project?
Very little. Brushed or trailed decoration on a single mug uses a tablespoon or two; a pint covers dozens of pieces. Only slip casting consumes slip in real quantity, at roughly a gallon per 8–12 small cast pieces.