Whats a good base for a candle wax sculpture? What does wax stick to best? Answered

If I understand you correctly then you want something inside the wax or in hidden areas for added support!?
Wood comes to mind as hot wax is soaked up and forms a good bond.
For re-enforcing old jeans or similar, even those fibreglass strips used when joining plasterboards are great to prevent things breaking off.

aluminum window screen seems a possible choice of a "superstructure" material.

One dip in wax will fill the gaps and allow more artistic application over it. One would of course need to from the basic shape first.

I can't really say what wax sticks to "best" other than wax itself, although anything porous is probably a good choice. It sure doesn't like coming out of carpet or clothing, or porous wood.

don't fly too close to the sun.

Look into "Lost Wax" for examples and suppliers..

In my experience using wax to hold a semiprecious stone to a wood rod for easy hand wheel shaping, polishing and grinding works very well...

To release we simply put the wax assembly into a freezer for 15min and thermal contraction pops the rock off clean...