I always recommend pouring melted wax from the double boiler into a pouring pot. Using a pouring pot reduces the chance of spilling melted wax and makes filling molds/containers easier and safer. Do not fill pouring pot more than 7/10 full. Be careful of hot water and steam when removing top section of double boiler.
How much wax do you need to use? For a mold, container candle calculate the amount of wax needed by filling the mold/container with water and measure it - 3 ounces of cold wax are needed for every 3 1/2 ounces of water. If using blocks of wax always place block in a plastic bag and place on a solid surface when you break up the wax with a hammer or screwdriver. Break wax into small enough pieces to fit into your double boiler. Softer waxes can be cut with a paring knife.
Melting wax can be volatile. Always use precaution when melting your wax and never leave melting wax unattended. Use a double boiler or vessel specifically made for melting wax. Constantly make sure that bottom section of double boiler does not boil dry. A candle thermometer should be consistently monitored and not allowed to touch bottom of the top portion of double boiler to record an accurate and consistent wax temperature. Once the water in the double boiler reaches it's boiling point, lower heat until it remains at a gentle boil. Once wax is completely melted, it will usually appear as a clear liquid this will be the time to place any additives you may be using. Additives may lower your wax temperature so be certain to bring wax back up to the required temperature for the particular wax you are using. At this time it will be ready to transfer your melted wax to the pouring pot.
When pouring melted wax, make sure of the following:
While filling a candle mold, candle container, or topping off a candle, make certain to use a pouring pot.
Always pour melted wax slowly and carefully.
Wipe off all wax drippings on sides of double boiler or pouring pot immediately.
Be sure to keep remaining wax available for a second pour, if necessary.