Deep Heat Pain Relief Spray, 150mlDeep heat spray is a pain relieving, warming, spray to be used on the skin. It is recommended for the relief of pain in muscles, tendons, joints or bones, lower back and thigh pain, sprains or strains. It can be used before and after exercise.when do i need a hot topical treatment? to treat everyday aches and pains such as tired, sore or overstretched muscles. To treat more painful conditions such as rheumatic pain, backache, sciatica, fibrositis and lumbago. Before and after exercise, when necessary and to treat minor sports injuries.how does deep heat work to treat pain? deep heat can be used to generate heat in tired, injured or sore muscles. As it is absorbed, your body’s natural enzymes turn its special blend of ingredients into a powerful painkiller.