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Repairing bone dry clay with slip

slip repair for bone dry clay

In this video, I’ll show you how I repair a bone dry clay piece with slip. It’s not yet fired. This is more for a beginner level.

I usually break a lot of my clay animals. Dry clay will always break easily, even more so with tiny detailed pieces. Clay figurines sculptures for smaller pieces is tricky, and I had to adapt my production for the pandemics. That’s why a lot of transport is now involved as I sculpt at home and only bring the bone dry pieces to the studio in order to fire them.

I move the pieces at their weakest stage so more often than not, I use slip or vinegar to fix a lost ear, limb or antler, as I’ll explain in this video. I added the english transcript afterwards for more detailed info.

Bone dry clay slip repairs

Video Transcript

Hi ! Today I’ll show you how to repair a broken bone dry clay sculpture.

It’s not yet fired but it broke while I moved it. The little moose lost its antlers. Here they are.

Bone dry clay and slip repairs

There are two methods, one with slip. Slip is a clay and water mix. The other method includes white vinegar. We mix dry clay and white vinegar that we can use as a glue. The main difference is that the vinegar mix will dry a lot faster. The fix will be quicker but might not be as sturdy as with slip. The slip will take a bit longer but might be a little sturdier.

These are quite big considering my usual work so I think I’ll use the slip. It’s exactly the same technique, you just have to be quicker with vinegar. I’ll start with the biggest antler. It’s kind of ugly at first. It’s ok. I put slip on both sides and then I put them together and wait a few seconds. Just after that, I’ll smooth it out with a brush. It shouldn’t be too moist in order to let the clay stick together.

Smoothing it out with a brush

Here we see it made a bit of a mess, I’ll smooth it with the brush. I find it better to work it with a tiny bit of water in order to put no pressure on the repaired part. Once fixed, these will be very very fragile. Even more so than regular bone dry clay dried without repairs. On this kind of piece, this is what will break the easiest. A small base will always try and break apart.I’m adding a bit too much here and then searching an angle to attach it here. It’s important to try and get the largest surface possible to attach your repairs. But as I added a lot of slip here I don’t see what I’m doing precisely. So I’ll try and recreate a kind of large spot in order for it to be a bit sturdier.

Planning for the next steps : glazing, firing

On this piece, I know that the underglaze painting might be delicate on this really fragile part here. So I’ll try and be extra careful… or I’ll forget as I usually do 😀 And I’ll repair it a second time.

Here, it’s fixed. It’s quite quick so you’ll have to pay attention and work with the driest brush possible and try and get the neatest result on the first try,because after that you will not be able to use any other tool than a brush it will break under a knife or a silicone brush.You can also use another method with this kind of repaired piece,and you can bisque fire it before underglazing it. That would allow a stronger piece to put color on.

Et voilà for this little moose !