How do i stop it from cracking?

any advice

Thank You

sounds like it might be too dry...you can add some crisco to it and work it in...that will help.

I had the same issue and stopped mixing ready made gumpaste and fondant. I bought some gumtex (or tylose) powder and add it to the fondant. I do not have the same cracking or seam issues anymore!

Microwaving is what I do...works really well.

Dont just use it straight from the packet, you have to knead it first to make it pliable, then 9/10 times you'll find that you dont have to put additional ingredients.

That happens when it starts getting dry or old. Sometimes the microwave will fix it, lots of kneading too. But if it's too old it might not recover. I prefer working with smaller pieces of it so the whole gumpaste doesnt dry.

Edna

I had the same problem and couldn't figure out what I was doing wrong. Then I had a light bulb moment - I live in Central Alberta, where it is quite dry but many of the sites I've visited to learn and practice are in warmer, more humid climates like Florida (Hi Edna!) and California. Add a bit more Crisco and I found using cornstarch rather than PS works wonders too!