yes, wax will stay on speed dip.
yes, the dip will bleed off into the wax when waxing, but so will dye.
I cannot tell you the temp for wax, but bring the temp up slowly, until the wax is completely melted, and starts to steam good. Lower traps into wax until completely covered, leave in for 2-3 minutes for traps to reach same temp, then slowly pull out and let drip, shake them a little helps as well. The wax on the traps should be about invisible- if white and thick, wax is too cold.
if using for water or coon.skunk, I wouldn't bother waxing them.
On cnaines, to hide the speed dip smell a little, I would for sure- and next year, forget the dip and dye them.....trappnman