What is the clay used to fix products in product photography? ... what is the substitute? ... where can I buy it? ...

It mainly depends on what product you are shooting. In product photography, fixed products need to be considered in several aspects: first, take care of the original products without being destroyed; Second, it is convenient to clean after shooting; Third, you can quickly change the orientation and find the angle of the product. At present, there are many kinds of products, so it's best to look at what materials the products are made of. Not all of them are fixed by the same commodity, and there are many substitutes. As long as they are easy to find or cheap, they can all be used. There are many things used in hardware and building materials, so go and have a look first; It is best not to use it, otherwise it will be a big problem to repair and it is not convenient to clean up. I hope it helps you!