This article introduces the use of polyester sailcloth fabric as a lining support. Discussed are several properties of the material and the importance of their contributions in lining. These properties include low stretch, good elastic recovery, lightness, durability, low water-absorption, good abrasion resistance, acid resistance, reasonably isotropic behavior, and excellent bonding properties. It is offered as a stiff lining support which will reduce strains and stresses within a painting while retaining the flexibility of a fabric support. Three examples of its use are cited. See AATA 19-956.