All about clay, part 3
Watch the area that's being worked on with clay. Watch for the visual changes being made.
Feel the clay glide across the finish. Utilize your senses within your hand to feel for the clay sticking, this may mean you need more lubricant. Also feel for the clay grabbing onto imperfections.
Listen to the sounds made as you clay. Listen for scratching sounds or if the sounds change.
This could save you both time and money from having to remove surface scratches from the finish. Using your senses should be an active part of claying.