John, when I want to confine my dent raising to a single area I use a relatively new wash cloth, light in color, and 4 layers thick. I saturate the cloth to the point that it is only dripping intermittently when held open and vertically. If your wash cloth begins to turn color, your probably to hot; start over. Heat guns are alot hotter than hair dryers so don't let the wash cloth dry out. Experiment with a scrap piece of wood first.
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