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Score & Slip: Joining Clay

Master the essential technique for creating strong, lasting bonds between clay pieces. Proper scoring and slip application prevents cracks and failures.

Difficulty: Beginner

Time: 1-3 minutes

Technique: Handbuilding

What You Need

Clay pieces

Needle tool or fork

Slip (thick clay paste)

Small brush

Sponge & water

Wooden modelling tool

Step-by-Step

Score Both Surfaces

Use a needle tool or fork to create crosshatch marks on both surfaces you're joining. Make the scratches deep enough to see but not so deep you weaken the clay.
Apply Slip Generously

Brush a thick layer of slip onto both scored surfaces. The slip should be like thick cream—not watery. It acts as the glue between your pieces.
Press Firmly Together

Align your pieces and press them together with steady, even pressure. You should see some slip squeeze out from the seam.
Compress the Seam

Use your fingers or a wooden tool to compress the join line, working the clay together. This is the most important step for strength.
Smooth & Feather

Blend the seam into the surrounding clay using a rib or modeling tool. Smooth with a damp sponge to hide the join line completely.

Studio Secrets

→ Match moisture levels: Both pieces should feel equally damp. If one is drier, mist it lightly first.

→ Thicker slip for heavy joins: When attaching handles or thick pieces, use slip that's almost paste-like.

→ Support while drying: Use foam or crumpled paper to support joined pieces as they dry to prevent sagging.

→ Work confidently: Press firmly—timid joins are weak joins. The clay can handle more pressure than you think.

Helpful Fixes

Seam cracks during drying

Slow down drying by covering with plastic. The join may have been too dry or not compressed enough—rehydrate the seam, reblend, and dry more slowly.

Pieces separate in firing

You likely didn't score deeply enough or used watery slip. Always use thick slip and ensure good compression of the seam.

Visible seam lines after smoothing

Blend when leather-hard with a damp sponge and rib tool. You can also apply a thin coating of slip over the area and smooth again.

Quick Checklist

Match clay moisture

Score both surfaces

Apply thick slip

Press firmly

Compress seam

Smooth & blend

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