Boiling it, will be your best bet.
Get the water hot and dip the bowl into it, remove all the resin that comes out to the water surface, as soon as it does, keep doing that until no resin appears on the water surface, by then, you bowl should be free of wax...!
After you done with removing the wax, rap the wet bowl with sandpaper or put it in a bag/box with dry wood shavings, this will allow the bowl to dry the excess water maintaining it original shape or very close to it...!
After the bowl is dry, coat with whatever you want...!
Good luck
Cheers
George