I learned of Zaino products when I first joined acurazine and have had many of their products. I still had a box of clay that I bought in 2006 that I found in the garage. The clay was unopened and still in the plastic, but was subjected to FL garage temps for nearly 14 years.

AND IT WORKS AMAZINGLY WELL!!!! I tried it on a spare car I had and it make it look amazing, lots of crud came off and discolored the clay with dark residue very quickly. I ended up using the whole bar on the car (toyota camry) and it looks spectacular! Don't worry about using clay that's a few weeks, months or YEARS OLD! I'll add some pictures in a bit once I'm done with the camry.

 

i, too, had some clay in sealed plastic, in a jar. sat probably for 7 years in the garage. Worked perfectly!
after all it's just clay! lol

 

It's clay. It sat in ground for millions of years before it sat in your garage. It'll be fine (if it doesn't dry out).

 

Isn't auto detailing clay refined with oils and other chemicals to ensure it stays elastic and doesn't scratch the paint? That's why I was impressed with it's usability with it's claimed shelf life vs clay in the ground.

 

Try Griot's products. The entire line will help you love your car once again...

 

I started off with Zaino by hand too back in the day...
I recently finished the clay I bought from them in 2009.