Re: what to paint on,
I agree with Ron. Use pva, not rabbit skin. Rabbit skin is too flexible and will only help with cracking later. The best support is rigid - wood, as it expands/contracts the least. The next is canvas on stretchers with keys in place. 10 layers of gesso is excessive, you only need 3-4 max. 10 layers is just a whole bunch more oil you will need to add to your paint because of all the sink-in you will have. Make sure gesso is totally dry before painting, or sink-in will be worse; unfortunately I know from personal experience. Also I have noticed that different gessoes behave very very differently in regards to sink-in. Goldens acrylic gesso is excessively absorbent, causing much sink-in. I have a talens gesso which is thankfully not so absorbent. And I've used oil primer, which is even better.