[detailed book on kiln building]

If you follow this link you will see a free download link to 21st Century Kilns which has a lot of kiln plans including a wood kiln. Excellent resource. Cheers.

http://www.clayartarchives.com

[Slip Cast Porcelain Warping]

Bryan sometimes warping especially using porcelain is caused by kiln shelves with marred or uneven surfaces. Your mug might “catch” on a chunk on your shelf which inhibits the piece’s movement during the glaze firing. I had this problem with cone 10 reduction firings using porcelain and it was solved when I bought advancer kiln shelves. Anyways look carefully at your shelves first before you start monkeying around with the slip recipe. And good luck!

[Frit Substitution Chart + Orton Cone Charts + Kiln Wash Recipes]

I got this recipe from Ron Roy many years ago and it's great:

20 EPK

20 OM4

60 Alumina

I brushed it on with a sponge brush, but Ron tells me he uses a garden sprayer to apply.