Can Restore be sprayed on? Or does this have to be painted by hand?

No, the texture is to thick to allow it to be sprayed on with a home sprayer. There may be commercial companies that can do this for you.

Rust-Oleum Restore 10x Advanced Resurfacer should not be sprayed. The reason for this is that the product may not lay out at the appropriate thickness which can then cause performance issues such as peeling. For best results, we recommend using the Rust-Oleum Restore Honeycomb Roller. https://www.lowes.com/pd/Rust-Oleum-Foam-Regular-Paint-Roller-Cover-Common-9-in-Actual-9-in/50125633