In the old version of the site, waxed paper was filed under "Other equipment"
But considering the many ways it has managed to make itself indispensable during my many candlemaking sessions, I have decided to give it a well deserved promotion and include it in the chapter dedicated to the equipment you MUST have!
Waxed paper (also called baking paper or parchment paper by our Canadian friends) is a paper that has received a treatment with sulfuric acid, which renders it entirely waterproof. Its main advantage where candlemaking is concerned is that paraffin (or any other wax) won't stick to it; so if you're a little clumsy while filling up a mold and some of the wax ends up where it shouldn't, provided that you had taken the precaution of covering your work area with waxed paper, all you have to do is wait a few seconds for the wax to set and then simply peel it off the waxed paper and put it straight back into your melting pot.
Its nickname of baking paper gives it away: waxed paper doesn't mind a bit being used in an oven. This will come very handy when you need to clean your metal molds or any other metal accessory: wick pins, wick holders, needles, you name it. Just put a sheet of waxed paper on a rack at the bottom of the oven, set the heat to 180°F and place your metal molds and other tools on the paper. Leave it all there for ten minutes and all the residual wax will end up on the paper. All that remains now is for you to wipe the equipment clean with paper towels (watch out, it will be very hot to handle), let the wax set, peel it off and set the wax paper sheet aside for another future usage.
And this is worth underlining: one of the advantages of waxed paper is that it can be reused again and again. As long as it only comes in contact with wax and does not get soiled (by candle dye, for example), just let the wax set, peel off and voilà!
Waxed paper can be found in any supermarket next to the aluminium foil and microwave cling film or you can get it from Amazon. It is often available in different widths; that's entirely up to you so pick the one that suits you best. I buy mine in a 38 cm (15 inches) width only because my workbench is 40 cm (just under 16 inches) deep and that allows me to cover most of it. When you have a choice, choose a roll of waxed paper above individual sheets, you get more freedom to use it as you want. And while you're at it: go for the non-bleached version, if available, it comes in a nice Kraft paper brown color.
Waxed paper is very affordable: in a regular supermarket, a 75 feet (23 meters) roll is typically priced under 2 dollars. But you can find it cheaper when you buy larger quantities (or in this case, bigger rolls): check websites that cater to restaurants and industrial kitchens. And when it's marked off, do not hesitate to stock up on it.
One last thing before I let you go: I have seen rolls of waxed paper with an INSANE price tag on various online platforms. Do not get scammed! Unless you live deep into the mountains of Mordor, you should never pay more than one dollar per 10 feet (3 meters) of waxed paper.