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Rex Johnson

Member Since 27 Jul 2010
Offline Last Active May 17 2017 12:23 PM

Topics I've Started

Show Me Your Handy Dandy Spray Booth

24 April 2017 - 02:59 PM

Though I work outside, spraying gets pretty messy.

I spray more stuff than I dip these days, platters up to 18", bowls of all sizes etc.

I've used a cardboard box with a squirrel fan but that didn't last long...


Outside of spending a big chunk on a commercial booth just to pull away the fog, I'm seeking an easy-up idea that will hold up to outdoor weather.


PVC and plastic? 2x4's and plastic? A plastic trash barrel?

What's your 'brilliant!' idea?....


Clay For Shino Glazes - Suggestions?

16 November 2016 - 10:52 AM

To start I've done several iterations of my reduction firings so I don't think that's the problem.


I've been experimenting with Tom Coleman and Malcom Davis shinos for a while.

I'm not getting the orange hues I expect, more tan-pink.


It's been suggested by a reputable source not to use B-mix and move to something like Soldate 60, possibly a clay with more iron content. That said Soldate 60 doesn't show iron (?), but somethng like LB Blend does.

I'm no clay chemistry expert by and stretch, so I'm grabbing at straws here.


B-Mix has been fine for throwing small pieces, and large pieces (sand or grog).

I manage to have a waste/loss rate of about 5%.

Note: I have to buy from Laguna because I can pick up, not ship.


I'd like to find a body I can do-all with, forgiving and flexible that would work with the shinos.


I'm all ears here...


...where's the oranges...






That Cold Top Shelf

07 November 2016 - 12:39 PM

My two kilns fire hotter on the bottom, per their design it's to be expected and I adjust to their inconsistencies.

That being said I'm often getting glazes that haven't matured up top, even at a cone over target.


Kiln 1 is a home built, about 24cu ft, two air assisted burners, down draft. Old skool.

Since this one isn't the perfect cube I expect an uneven firing.


Kiln 2 is the Olympic up draft with 4 venturi's at the bottom, notorious for being hotter on the bottom, tempermental and finicky to fire in general.


Now here's the thing. I did a firing this weekend with cone 5-10 glazes of varying ilk. Mostly Malcolm's Shino and a Temoku that have a wide range.

Most pots matured well enough, and especially nice depending on the location down under.

I fired to cone 7 to make sure I'd get everything nice and melted, including a 20 minute soak. 2265F.


But... the top shelf, and this has happened before, where all dull and not matured. Mostly flat slab pieces.

They had a good 4" space below the lid.

I'm thinking maybe it might be the draft of the lid's flue, OR, that maybe there should be an additional shelf covering the top shelf to retain heat .


This has happened before, and the glazes look like they are sandpapery, like they've been over oxidized if that's possible.


Your thoughts...





Does Ceramic Fiber Deteriorate?

22 September 2016 - 02:19 PM

...wondering...my saggar kiln made from a 50 gallon drum seems to take longer to fire after a couple years of use.

Yes, it sits outdoors, but it normally stays covered with a tarp in the winter.

Just seems to fire slower.

Maybe 2 1/2 hours in the past, but at least an hour longer to get to cherry red/orange.


better days...don't have a recent pic on hand but she's getting uglier woth age...




but hey, here's a pic of the studio cat...


Cobalt For Brushing Decoration - Keeping It Mixed...?

14 July 2016 - 09:22 AM

I'm still having a heck of a time trying to get my cobalt oxide and carbonate with water to stay consistent for brushwork.

I don't remember ever having this issue.

It just settles at the bottom of the jar, and very quickly making it hard to get a consistently loaded brush.

I like to use cobalt for alot of accents and drawing but it's always a pain...


Any ideas?