Natural Pine Rosin Microwave Strip Wax Microwave Natural pine rosin strip wax 100% pure pine rosin that spreads easily into a thin even layer with a powerful grip, optimising the treatment. This natural formula with a liquid texture and the scent of pine is perfect for large areas of the body and easily heated in the microwave. Useful Tips Place wax in the microwave, without the lid, and heat for a minute on medium power.