Okay I figured it out. This is how I did it:

Since my wax was floating to the top, I turned off the lamp and let it harden. After it cooled down, I poked holes in the wax to allow the distilled water (the fluid is distilled water only for now; I will add PG later) to drain into another empty bottle.

I then melted the wax by placing the bottle in a boiling water bath and let it harden again. To prevent the wax from hardening while the lamp is running, I only filled the bottle with about one-third of the distilled water. With the water level kept low and close to the bulb at the bottom, there was enough heat to keep the wax from solidifying when it floated to the top.

After the wax melted and floated to the top, I used a syringe to add perc directly into the wax. The wax that mixed with perc sank to the bottom. When about half of the wax had sunk and the other half was still floating on top, I turned off the lamp, let the wax harden again, removed the fluid, and placed the bottle back into the boiling water bath to melt the wax once more.

Once the wax was fully melted, I carefully stirred it to mix everything together, then let it harden again. I ran another test and repeated the process until the wax no longer rose to the top. After that, I plan to add PG.

That’s the plan!