I received a phone call the other day here at World by the Tail, Inc. A veterinary clinic was using two patties to make a print for a VERY large dog. They were having some trouble mixing the two patties together. The caller was wondering if I had any tips for how best to do this.
I do! The key is to get the clay really soft before trying to mix the two patties together. It definitely takes more doing than just one patty. You shouldn't have to put two together very often... only for really big pets! (like Mastiffs!)
Now, don't laugh at me... I know you'll want to. But, I got this tip quite a while back from another customer... and it works!! Very well! If you know that you are going to have to mix two kits together, start a bit ahead of time. Get the two patties and, still in their plastic bags, place them under your behind and sit on them! Yep, I said, "sit on them". While you are doing paperwork or other desk work, you can be softening up the clay with your own body heat! It truly works.
When you go to soften them up and mix them together, they will be more pliable and it will take less time and effort! You can, of course, do this for just one kit as well!
DO NOT microwave. This may seem like a good solution initially, but what it really does is to advance (in essence: BAKE) the clay. It will cause the print to be less likely to hold up for the long term, and to crack more easily! If you don't have any time to sit down on the job, you can use a heated pack that you can microwave (like a first-aid hot or cold pack). Heat this in the microwave and then put the pattie(s) between this to soften.