Conditioning Kato Clay | Cara Jane Polymer Clay Conditioning Kato Clay | Cara Jane Polymer Clay

Conditioning Kato Clay

Posted on April 25, 2010

Having recently discovered Kato clay I am now a complete convert. I love the Kato clay to work with and I now find Fimo too soft and sticky (although I now realise this is a problem with fimo at the moment). The problem with Kato is it is SO difficult to condition. I haven’t tried the latest formulation of Kato which is supposed to be easier to condition yet.

I have tried some different methods for conditioning Kato clay and here are my findings.

As I would Fimo
With Fimo and Premo you can just squash up a bit of clay and roll it through the pasta machine. The odd block of Fimo would be a bit more of a challenge and would need a bit of squishing and rolling in your hands first before it was soft enough to be rolled in the pasta machine.
This doesn’t work for Kato, it is too firm for me to squish into a ball from the packet and many blocks just fall into crumbs the minute you try.

Cutting slices
I found out about this from Sue on Cindy Leitz’s blog, she passed on the information given on an Australian clay suppliers website Over the Rainbow. 

Cut a bit of clay and roll it firmly to flatten the clay. Lift it and turn it so it doesn’t stick to your work surface. Keep rolling until it is just a little thicker than the thickest setting on your pasta machine (that’s a good time to get those thickness chips out to see how
thick it needs to be).Roll the clay through the pasta machine on it’s thickest setting. Without folding or bending the sheet roll it through a thinner setting. And again without folding another thinner setting, the aim is to make a thin sheet as thin clay conditions faster. When you have thin sheet fold it and roll it and continue doing so until it is conditioned.

This works but it is slow and I am impatient. Each slice is small and if you are using big amounts of clay it takes far too long. The secret I worked out at last is the initially rolling. If the clay is crumbly roll it more with the rolling pin first or you get crumbles in the pasta machine as shown (I hate that!). I try to short cut putting several sheets together but I think it is best to have them part conditioned first on reflection before bulking up. This is also basically the method recommended by Donna Kato herself and she should know!

Food Processor

I bought a little chopper just for clay. I found I could put about 2oz of clay in at a time without stressing the motor (getting horrible grinding noises) as long as I chopped them into pieces about 2x1x1cm. Run the chopper in bursts until the clay is lots of fine pieces. I then find it easiest to put the clay crumbs into a Ziploc bag and then roll them with a rolling pin in the bag. This helps the crumbs to stick together with no fear of loosing them. The clay is nice and warmed up by now and should go through the pasta machine no problem. A couple of rolls and it is ready to use.

To be honest this is a fair bit of hassle too. It’s great if you are colour mixing from a recipe as you can just put the parts in the chopper and it is more than half mixed already. I am buying big blocks of Kato the 12.5oz ones so will probably have a conditioning session at the start of a project using the chopper and then store the clay in sheets. They can easily be reconditioned by passing through the pasta machine.

The bottom picture shows what it looks like out of the Ziploc bag on the left and after first pass through the pasta machine on the right.

Jana whack
This is the method used by  Jana Roberts Benzon. Basically you take your block of clay and whack it. Leave the clay in the wrapper and whack it with a hammer, rubber mallet, wooden rolling pin. Works pretty well and is a good arm exercise, tension reliever. Not ideal with those who have problems with hands/arms and it means getting stuff not in my clay kit out. You still have to do a bit of rolling to get it thin enough to go in pasta machine but no crumbs in sight!
(more info in an article at Polymer Clay Express )


Since I wrote this I have found that if I am colour mixing a fair amount of clay I use the chopper but other than that I tend to use the slice method cause as long as I roll well to start with crumbs are avoided and it saves getting extra kit out. I am using the big blocks of Kato so I do 1/4 block at a time – about 3 oz. This would be 3 slices so it isn’t so bad.

Anyone else got any conditioning tips to share? I have heard people talk about driving over it with their car but that’s a bit extreme for me I think!


  1. Cara, another good way to condition Kato is to cut in slices and put it in a Zip Loc Freezer bag. Squeeze the air out of the bag and seal it and then put it on the garage floor and whach it with a mallet. Keep turning the bag. This works good. I tried running over it with the car but the bag stuck to the wheel, husband was very unhappy.

  2. Maybe it’s just as well I can’t drive and don’t have a car, that would be too tempting! I’m going crazy here (in the UK) waiting for my Makins clay machine to arrive.(I managed to break a cheap pasta machine so decided to invest in a really good one) The supplier was out of stock and awaiting a delivery from the USA, and what happens – a @**@* cloud of ash from a volcano in Iceland, that’s what! and I’m really hoping it will turn up soon.

  3. I still cannot condition my Kato clay. I even broke my Makins clay machine. A bummer since my motor came after the machine broke. Until I can at least get it to stick together, am not willing to risk my other machines. I have tried pounding and chopping it to no avail. I live in Hawaii and don’t know if it cooked on the way over? Any other suggestions or places I can donate to? I have a LOT of the “old” Kato clay.

  4. I’ve just found that Living Doll Light, which I’ve been using for years, seems to have changed it’s formula -think they, like many other clay manufacturers, have removed the phalates. Disaster for me! But I found an old block of Katoclay and tried it yet again. The old block is very dry and hell to condition as usual but I cut a thin slice from the block and WARMED it with a hairdryer. Softened in a minute and is just perfect! Think I’ve found the answer to my problems. This is a fabulous clay once you’ve got through solving the conditioning problems.

    • Hi Jamie Sorry this got lost in a sea of spam! The newer Kato polyclay is much easier to soften. They have also just brought out a doll clay which you would be interested in I am sure. Have dun Cara

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