TL;DR: To create porcelain home decor, start with a pourable porcelain slip, cast it in plaster molds, then clean, fire, and glaze the pieces. This guide walks you through casting, finishing, and decorating porcelain vases, trays, and ornaments for a polished, professional look.
Step 1: Gather Your Materials
You will need porcelain slip (pre-mixed is easiest for beginners), plaster molds, a bucket, a stirring stick, a sponge, fine sandpaper, and a kiln. For decoration, gather underglazes, clear glaze, and brushes. Work in a well-ventilated area and wear a dust mask when handling dry porcelain powder.
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Step 2: Pour and Cast the Porcelain
Stir the slip gently to remove air bubbles. Pour it steadily into your plaster mold until full. Let it sit for 5–15 minutes depending on the wall thickness you want. Pour the excess slip back into your bucket, then let the mold drain upside down for a few minutes. The cast piece will firm up as the plaster absorbs moisture.
Step 3: Release and Clean the Piece
Once the porcelain is leather-hard (firm but still cool), gently remove it from the mold. Use a sponge to smooth seams and a fettling knife to trim rough edges. Wrap the piece in plastic overnight to equalize moisture, then let it air-dry completely for 1–2 days.
Step 4: Bisque Fire and Glaze
Fire your dried porcelain to cone 06–04 for a bisque firing. Let the kiln cool slowly. Sand any rough spots with fine sandpaper, then wipe with a damp sponge. Apply underglaze for color, let it dry, then dip or brush on a clear glaze. Fire again to cone 6–8 for a durable, glossy finish.
Tips for Success
Keep molds dry between pours. Avoid thick walls—they crack easily. Test glazes on scrap pieces first. Porcelain shrinks about 12–15%, so plan sizes accordingly. Always fire slowly to prevent thermal shock.
FAQ
Q: Can I use air-dry clay instead of porcelain slip?
A: No, air-dry clay lacks the strength and translucency of true porcelain. For functional decor, you need a kiln-fired porcelain slip.
Q: How do I prevent my porcelain piece from warping?
A: Dry it slowly under plastic, support thin areas with wadding during firing, and avoid handling it while leather-hard.
Q: What is the best glaze for food-safe porcelain trays?
A: Use a commercial dinnerware-safe clear glaze and fire to the manufacturer’s recommended cone, usually cone 6 or higher.
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