The use of fiberglass as a material to make forms for concrete work has increased rapidly within the past two years. Among the reasons are: fiberglass forms provide a means of producing a concrete surface that is architecturally acceptable without rubbing and grinding. Two, special patterns and designs can be readily molded into the material. Three, large areas or sections may be made without joints or seams. Four, when repeated usage is possible, fiberglass is often the most economical form material. And five, perhaps most important, fiberglass forms allow the architect complete freedom of design. One advantage of fiberglass forms is it is possible to eliminate the joints or seams. Also when special conditions dictate building a form in sections, it is possible to join the units in such a manner that the several sections may later be sealed together with additional applications of resin and fiberglass to produce a seamless mold. Versatility is another advantage. Fiberglass panels can be 100 percent reversible in any situation. Fiberglass is also an excellent insulating material and is impervious to moisture; thus fiberglass forms provide built-in protection against temperature extremes. Although the first cost of fiberglass forms are relatively high, the durability of the material permits almost unlimited reuses. Consequently, wherever it is possible to make repeated use of the same form, the cost may be reduced substantially to a point that the material becomes the lowest cost per use of any form.