I did a test fit and the cover just slid right on and stayed in place. Is that all that’s to it?
You don't "pot" them with the wax.
You place one small drop of wax on top of one bobbin. Put the cover on, solder it shut with pretty high pressure so that the top sits on the wax on the bottom. Heat the top with a hairdryer so that the wax melts between bobbin and cover.
That is how the SD covers come mounted. The only trick is generating the pull to not end up with a loose cover and to heat up just enough for the wax to melt but not float around.
Say what??? Most folks who offer wax potted pickups DO use a pot filled with melted wax. You drop the pickup into the pot and when no more air bubbles come out of the pickup you're done and all the spaces inside the pickup and cover are filled with wax. That's how it's usually done.
Or in other words: the coils are waxed by actually putting them into a pot. But when the cover is put on afterwards the whole cover is not filled with wax, just a drop on top of one bobbin. I have seen that several times.
I describe what has been done to the Seymour Duncan pickup covers that I took the cover off that were obviously unmolested before, that means the potting done by Seymour Duncan.
This is for the cover only. The coils have obviously been potted before putting in the cover in the manner I describe.
Or in other words: the coils are waxed by actually putting them into a pot. But when the cover is put on afterwards the whole cover is not filled with wax, just a drop on top of one bobbin. I have seen that several times.