its not always true , the temp is no problem here .
but the shape of the mold is
if you got a cavity inside the mold that is lower than the connection to the main barrel , as a dolphin for example .
then you get some residues left there , if its wax it will evaporate and burn so thats no problem .
but with a metal used instead of wax it will stay there
it got almost the same melting temp as wax , but wax got the advantage to evaporate and it starts burning by itself at approximately 250-260 degrees celsius, depending a little on what type of wax it is .
so everything depend on the shape of the mold if its useable or not
but the wax aint that expensive , and personally I recover most of it
all chps made when turning can also be remelted
I got several hundred pounds of candle stumps so I have enough for a lifetime or two
and more comming a couple of times each year
I got a friend working as a janitor at our church , so he brings me the stumps every time they change them
its just to melt them and pick the wicks away and its ready to use
if you bend a very thin piece of sheetmetal to a tube and hold it togeter with tape you can get whatever diameter you need , or if you got a silicone mold its no problem at all .
got a lot of boxes like this all over the place