When you are preparing your sand mold on the beach, you need to dig a hole. Anyone who has worked with sand knows that keeping the shape of dry sand is very difficult. It is best if you wet it down. If you happen to forget a bucket or cup.....
Dig your candle out of the sand.
The bottom and sides of your candle will be covered in sand and rocks. You will need to cut the wick to a reasonable length and place your candle on a surface safe for burning and collecting the wax if it runs. (I recommend a plate with a lip, add some sea shells, more rocks, and sand around it for decoration if desired.
Enjoy your candles!