What are you using for your armature? Ive found that if I use a solid armature, such as newpaper wadded up and taped, there is no problem. I did try using a balloon recently to make a hollow piece for a lampshade and it did warp pretty badly, and almost imediately.  I tried covering a balloon with masking tape to hold its shape, no bueno. I finally got it to work, I took 2 deflated balloons, put one inside the other, blew up the one on the inside and tied them both off together.  Worked out fine, I have 2 layers of mache strips on it now with no warping.   :twisted:

Thanks folks = )

I'm trying out different mixes with much lighter application, so far no full success. Although, I am finding that the thicker, more gel like my mix is the less warpage I get (granting I apply lightly) and it sticks well. I'll keep testing.

You might be able to push one balloon inside another using the eraser end of a pencil, but that's just a guess.

I've never had warping with a balloon, unless it had a slow leak and started deflating before the basic shell hardened enough to hold its shape.

When covering a balloon, set it in the mouth of a round container that is smaller than it is, just so you don't have to keep chasing it around the table.

Sue

Making the balloon more stable.  I posted under another subject to say that I sometimes put the balloon under the tap and fill it about a quarter before blowing it up full size.  I find it will stay on a support quite sturdily while I work.  Sue (Catperson) said she found it could leak but I never had that problem.  Of course you do have to tie the neck of the balloon itself rather than close it with string.
DavidO