Moldmaking Casting Materials Sculpture Modeling Art Supplies MoldGel is a prosthetic grade alginate that mixes easily into a roughness free surfacecreamy consistency supplying the best in forensic detail right down to the fingertips. MoldGel sets in 3 to 5 minutes. Its three to 1 water to MoldGel mix ratio makes the right choice for larger applications like torsos faces. The 1 box will yield up to 4 pounds of molding gel alginate that is absolutely safe for skin food applications. The 10 box will yield 40 lbs of molding gel alginate. The 20 box will yield 80 lbs of molding gel alginate. Sculpture Modeling Moldmaking Casting Materials.