I am a reliable and diligent amateur graphic designer who maintained and operated a wide-format digital printer for approximately a year. Though I have no formal qualifications, I have gained sufficient knowledge and experience to service customers who require designs for business cards, for leaflets, for banners of PVC, and for general signage that partly comprises paper or self-adhesive vinyl. Owing to a lack of technical knowledge, I do not presently design graphics that are intended for sheets of self-adhesive vinyl that are to be applied to windows (my present understanding is that if dark colours are used to too great a extent, an average pane of glass that is exposed to direct sunlight for extended periods may crack as a result of the heat that is generated as solar radiation is absorbed by the relevant dark colours).