Plast-Aid 6 oz. Kit. Plast-aid is a 2-part compound, a liquid and a powder. Its like nothing else on the market. When combined a unique curing process begins, as it thickens it transforms from a liquid to a glue as it transforms to a solid. After about 10 minutes it forms a hard durable waterproof acrylic plastic that can then be sanded, drilled or even filed.