TL;DR: To glaze a porcelain vase, first clean the bisque-fired surface, then dip, pour, or brush on a commercial glaze, and finally fire it to the clay body’s maturity temperature. This guide covers each step so beginners can achieve an even, glossy finish without common defects.
Step 1: Prepare Your Bisque Vase
Start with a bisque-fired porcelain vase—never glaze greenware. Wipe the vase with a damp sponge to remove dust. Check for scratches or bumps; sand lightly with 400-grit wet/dry sandpaper if needed, then wipe again. Porcelain bisque is dense and smooth, so any oil from your hands can cause crawling. Wear clean cotton gloves from this point forward.
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Step 2: Choose the Right Glaze
Use a commercially prepared glaze labeled for porcelain (cone 6–10, depending on your clay). Avoid mixing your own glaze as a beginner. Stir the glaze thoroughly—sedimentation is normal. Test the glaze on a small porcelain tile first to confirm color and fit.
Step 3: Apply the Glaze
For even coverage on a vase, pouring is easiest. Place the vase upside down over a bucket. Pour glaze over the outside, rotating slowly. Let it drip, then wipe the foot ring clean with a damp sponge—bare foot is essential to prevent sticking. For the inside, pour glaze in, swirl, and pour out. Aim for a 1–2 mm thick coating. Too thin looks dry; too thick causes running.
Step 4: Fire the Glazed Vase
Let the glaze dry completely (at least 12 hours). Load the kiln with the vase not touching other pieces. Fire to the temperature recommended for your glaze and porcelain body—typically cone 6 (2232°F) or cone 10 (2345°F). Cool slowly to avoid thermal shock.
Tips for Success
Keep glaze layers uniform. Stir glazes often. Clean the foot ring twice. Always test-fire a sample. Porcelain shows glaze flaws easily, so patience pays off.
FAQ
Q: Can I glaze a porcelain vase that was fired to cone 04 bisque?
A: Yes, as long as your glaze matures at cone 6 or 10. The bisque temperature just needs to be lower than the glaze firing.
Q: Why did my glaze crawl or bead up on the porcelain?
A: Usually due to dust, oil, or too-thick application. Wipe the vase with a damp sponge and apply thinner, even coats.
Q: How do I prevent glaze from sticking the vase to the kiln shelf?
A: Wipe the foot ring completely bare with a damp sponge before firing, leaving no glaze on the bottom 1/8 inch.
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