Follow these tips for the perfect burn for your scented glass jar candle: Always trim wick to 1/4 inch before lighting and keep debris out of wax pool. Candles should never burn longer than a 4-hour interval. Set candle on heat-resistant surface and avoid drafts. Always burn within sight and extinguish before leaving room, don’t burn near things that catch, and keep away from children and pets. Don’t extinguish with water. Always let wax harden before relighting, touching or moving.