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S. Dean

Member Since 18 Jun 2013
Offline Last Active Today, 07:51 AM
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Posts I've Made

In Topic: Pie Dish Dilemna - Rough, Porous Clay

16 August 2015 - 09:58 AM

My guess, could be earthernware that sat on silica sand in the kiln, some happened to migrate into the pores?

 

Totally confused on what this could be. That is my best/worst guess. Never heard of any clay body dropping small sandy particles.

 

Similar thought/speculation.  Maybe the potter has mixed alumina into their wax and it migrated into the pores? This can leave a dusty fine residue on the pot.  If its this, the pot should be fine once all the alumina is cleaned up.  

 

+1 for Neil's wet sanding suggestion.

 

-SD  


In Topic: Bisque Blowouts

09 August 2015 - 06:31 AM

Seems like the firing is too fast.   

 

Did your work blow up in a bisque firing or were you trying to raw fire your work in the glaze firing of her bisque ware?  If the latter, that firing schedule is too fast - your pots need to go through a slow bisque firing.   If you continue to fire with her, she will need to adjust her firing schedule to accommodate your clay's requirements.  If she is unwilling to change her schedule, maybe its possible for you to rent the kiln from her and do a full load with only your work.  

 

-SD


In Topic: Wax Resist

01 August 2015 - 08:06 AM

I find Forbes wax is great when applied to the clay body (quick drying, resists well and water-based so it cleans up easily).  However, Forbes has a tendency to peel when applied to certain glazes.  

 

Here's a blog link with a some good info about Forbes and Mobilcer resists. 

http://www.carolclar...-Mobil-Wax.aspx

 

Here's what Highwater says about these waxes:

 

Note: Mobilcer is oil-based and Forbes is water-based.

Forbes wax is a water-based wax that is good for waxing the bottoms of pots.  It dries quickly and can only be used on top of glazes that contain gums and binders. It will not stick to dusty glaze surfaces for resist decoration.  This is the wax Linda Arbuckle uses for her stunning majolica pots.

Mobil wax is oil-based and thicker than Forbes. Mobile works well for wax resist glaze decoration and takes about 30 minutes to dry. Even though it is oil-based, Mobile can be thinned with water to improve brushability. If it separates during storage, shake well before use. 

Do not allow either wax to freeze.


In Topic: Newbie High-Fire Glaze Question

01 August 2015 - 06:37 AM

Josh,

 

Assuming that your work is functional, the general rule is that your glaze firing needs to be done to the cone range/heat work at which your clay body matures.  This is done to avoid problems with 1) under firing the clay body (not vitrified, remains porous) as mentioned in other responses, and 2) over firing the clay body (bloating, slumping, melting). As glazes suffer from their own sets of defects when under and over fired, you need to use a glaze that correspondingly works in the firing range at which your clay body matures. 

 

-SD


In Topic: Respirators, Beards, And Mixing Glazes

30 July 2015 - 11:19 PM

I use the 3M 7500 series with a P100 cartridge.  I've found Envirosafety to have excellent prices and fast shipping.  This combo is sold as an asbestos abatement mask.  Can't personally speak to the beard issue.   

http://www.envirosaf...rator-kits.html

 

Here's a helpful link which answers questions about size, fitting, beards, etc.

http://www.envirosaf...g-the-size.html

 

-SD