This type of wax is ideal for invitations, thank-you cards and any professional mass mailing work. Easy to use, simply light a candle and turn the end of the wax stick over the flame, then gently rub the melted wax on the envelope. Or just load into a glue gun and pull the trigger for a perfect seal every time. This wax will remain very pliable even after application on your cards, envelopes or packages.