Mike: I was being factious about removing all the old dip. I don't know of anybody who does that seasonally. I treat dipped traps the same as you, boil them clean and redip them.
However, this mystery with "wax nodules" begs to be solved. Wax melts somewhere below 100° C, which is the boiling point of water. If your traps are submerged in boiling water, any wax that is on them must liquefy
. It cannot remain in solid form
. Under ordinary conditions, this liquid wax then floats to the top of the boiling kettle (wax is less dense than water). This could be the source of your problem.
If you lift traps up through this layer of liquid wax that floats on the surface of the kettle, it is possible to re deposit the wax back onto the trap. In fact, this is the old fashioned method for waxing traps -- you melt a cake of wax on top of some boiling water, submerge the traps into the water, let them warm for a minute, then pull them back up through that layer of wax. (But this doesn't do a very good job of waxing them.)
Could this possibly be the source of the wax "nodules" on your traps? Are you pulling the trap up through the layer of wax that you just boiled off of them?
To avoid this problem, some folks add water to the kettle when they are done until it overflows, this way, the old wax is carried away with the overflowing water.
I use a different method because I don't like to kill the boil on my cleaning kettle. I have two kettles of boiling water one is for rinsing the traps. For starters, I clean traps in the order they are most likely to be dirty, bodygrips first, water traps next, and finally, the waxed land traps. When I am removing traps from the cleaning kettle, I maintain the kettle at a rolling boil
and pull the traps out quickly. This leaves very little old wax sticking to them. I immediately dunk them in the rinse kettle. Sometimes the rinse kettle will get a thin layer of wax on it and I have to overflow it to get rid of the wax, but most of the time, I don't have to do that as the rinse kettle stays fairly clean.
Back to the point. If you have wax stuck to the outside of your traps, after you have boiled them, there is something wrong. Could the above explanation be applicable?