Cut out 2" wide strips of Â½" or 1" wide fibreboard to make
a box the desired size, ie, 4 strips 9" long. Nail together with plain
2_ common finishing nails, 2 per side. Pre fire to 25 degrees higher
than the hottest temperature you will reaching with this technique.
This burns off the binders in the fibreboard.
Remove your kiln shelf from your kiln and place on a
table, with 2 edges just off the table, to make picking it up after
easier. Lay the frame on your kiln shelf, no kiln wash or shelf paper
Using a fine kitchen sifter, begin evenly sifting in Pottery Powder #1.
Continue until powder has filled the fibreboard frame.
Take a long piece of glass and level off the powder. Be as gentle
as possible doing this. You do not want to compress the powder.