A method and apparatus for transmitting and receiving a Hybrid Automatic Repeat reQuest burst in a communication system are provided. The coating has as its task to protect the surface against oxidation, corrosion, wear and hydration. Preferably each gallon of the transparent protective coating contains: 2308. The machine advantageously comprises two chambers to carry out simultaneously the deburring of the workpieces loaded into the chamber inserted in the press and the unloadingloading of the other chamber positioned outside the press. The closed cellular polyurethane foam pad may have a Shore hardness of substantially 55-60. Also included are novel compositions, including naphthalimides and naphthalimide salts, analogs thereof, as well as stable liquid dosage forms thereof.