The Vical acrylic should be clean and dry at the start of each buffing operation. Some polishing compounds leave the surface clean after buffing. Where these materials are not used, washing should follow the last step in polishing.

If the part has previously been sanded or is deeply scratched, an abrasive coated wheel is used first. The abrasive is a standard polishing compound composed of very fine alumina or similar abrasive and tallow.

When most of the scratches have been reduced on the first wheel, the Vical acrylic is buffed on a wheel charged only with tallow. These first two wheels should be air­ventilated rag wheels and should operate at 3000 to 4000 surface feet per minute.

The Vical acrylic is next brought to a high polish on a soft, loose buff on which no abrasive or tallow is used. These cleaning buffs should be very loose and should be made of imitation chamois or cotton flannel. The wheels should be 10" to 12a in diameter and should run at 2000 to 2400 surface feet per minute. A hand applied coat of wax may be used in place of buffing on the finish wheel if desired.

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