On most of my projects I use Rust Oleum 2x clear https://www.amazon.com/Oleum-280702-American-Accents-12-Ounce/dp/B00KZ6LYMM/ref=sr_1_1?ie=UTF8&qid=1478291107&sr=8-1&keywords=rustoleum+2x+clear+glossLike that one from Amazon, but I buy it locally from any of the hardware type stores (home depot, lowes, ace, walmart, menards)
I also buy different spray polys or lacquers from time to time. The rustoleum is cheaper, and clear for painted projects.