Reddit reviews Masonry Rubbing Brick 6 X 3 X 1 20 Grit
We found 1 Reddit comments about Masonry Rubbing Brick 6 X 3 X 1 20 Grit. Here are the top ones, ranked by their Reddit score.
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Glaze on the shelf will liquify again and again. Covering little drops with kiln wash might overwhelm the glaze with its refractory properties, or some of the glaze might seep a little and attach to pots. You would need to grind the foot or sand the pot to get the glaze off. The bottom line is there is going to be some work either in preparation before the firing, or fixing some pots after the firing.
Buy something like this product (probably cheaper at your local hardware supply). Wear a respirator when you scrape your shelves.
https://www.amazon.com/MARSHALLTOWN-RB192-6-Inch-3-Inch-1-Inch/dp/B003A83G8M