Many people I know, use a system such as a 'Wagner Power Sprayer' when doing large amounts of traps.
Lined up in a row, on plywood, it goes fairly smooth.
I have painted traps, the used a (cold) wax , such as FMJ with some success.
You don't need to wax a painted trap.
Most animals will remove it when caught regardless.
Whatever treatment is on The No BS traps, beats anything I've ever used !

Just did 36 1 1/2’s, 15 650’s, and 8 DP’s using a quart of rustoleum and a quart of acetone mixed 50/50. Still have a quart of the mix left to dip another dozed DP’s and 15 155’s.