Use a can of clear coat. I think I use Rustoleum. Once your done installing, a quick couples of passes with the clear coat and those new nuts and bolts stay shiny. One can of clear coat is about $6 and trust me, you can spray a LOT of bolts.

Jeff

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton